Hunter Mahan of the U.S. watches his tee shot on the second hole during the final round of the British Open golf championship on the Old Course in St. Andrews, Scotland, July 20, 2015. REUTERS/Phil Noble

Hunter Mahan of the U.S. watches his tee shot on the 13th hole during the first round of the British Open golf championship on the Old Course in St. Andrews, Scotland, July 16, 2015. REUTERS/Paul Childs

Hunter Mahan of the U.S. watches his tee shot on the first hole during the first round of the British Open golf championship on the Old Course in St. Andrews, Scotland, July 16, 2015. REUTERS/Lee Smith

Hunter Mahan of the U.S. hits from a sand trap onto the second green during third round play of the Masters golf tournament at the Augusta National Golf Course in Augusta, Georgia April 11, 2015. REUTERS/Phil Noble 

Hunter Mahan of the U.S. celebrates his eagle on the second hole during second round play of the Masters golf tournament at the Augusta National Golf Course in Augusta, Georgia April 10, 2015. REUTERS/Phil Noble 

Hunter Mahan of the U.S. chips onto the second green during his practice round ahead of the 2015 Masters at the Augusta National Golf Course in Augusta, Georgia April 7, 2015. REUTERS/Phil Noble 

European Ryder Cup player Justin Rose tips his cap in the 18th green after finishing his 40th Ryder Cup singles match against U.S. Ryder Cup player Hunter Mahan at Gleneagles in Scotland September 28, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan celebrates winning the first hole during the 40th Ryder Cup singles matches at Gleneagles in Scotland September 28, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan watches his tee shot on the fourth hole during his foursomes 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan hits out of a bunker on the third hole during his foursomes 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (L) and Jim Furyk celebrate going four up on the 14th green during their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (R) and Jim Furyk celebrate going four up on the 14th green during their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

European Ryder Cup players Jamie Donaldson (L) and Lee Westwood congratulate U.S. Ryder Cup players Hunter Mahan (2nd R) and Jim Furyk on the 15th green for winning their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (L) and Jim Furyk celebrate going four up on the 14th green during their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan stands on the fourth fairway during his fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (2nd L) and Jim Furyk (C) cross a bridge as they walk to the 11th hole during their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (L) and Jim Furyk celebrate on the ninth green during their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (L) and Jim Furyk walk along the ninth fairway during their fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan lines up his tee shot on the sixth hole during his fourballs 40th Ryder Cup match at Gleneagles in Scotland September 27, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Zach Johnson (L) and Hunter Mahan walk to the eighth green during their foursomes 40th Ryder Cup match at Gleneagles in Scotland September 26, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

Team U.S. players (L-R) Jim Furyk, Hunter Mahan and Phil Mickelson wear sunglasses during the opening ceremony of the 40th Ryder Cup at Gleneagles in Scotland September 25, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SPORT GOLF)

U.S. Team players Phil Mickelson (2nd L) and Hunter Mahan leave with their wives Amy (L) and Kandi after the opening ceremony of the 40th Ryder Cup, at Gleneagles in Scotland September 25, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF ENTERTAINMENT SOCIETY)

U.S. Ryder Cup player Hunter Mahan signs autographs as he leaves the 18th green during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 25, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SPORT GOLF)

Spectators watch U.S. Ryder Cup players Hunter Mahan (L) and Zach Johnson putt on the 16th green during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 25, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Bubba Watson (L) lines up his putt on the 16th green as teammate Hunter Mahan walks by
during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 24, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players (L-R) Bubba Watson, Zach Johnson and Hunter Mahan walk over a bridge to the 11th green during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 24, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan hits from the rough on the 12th hole during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 24, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

John Wood, the caddie of U.S. Ryder Cup player Hunter Mahan stands on the ninth green during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 24, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF TPX IMAGES OF THE DAY)

U.S. Ryder Cup player Hunter Mahan hits from the rough on the ninth hole during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 24, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan practices on the driving range ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 24, 2014. REUTERS/Toby Melville (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Zach Johnson (L) and Hunter Mahan walk along the seventh fairway during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 23, 2014. REUTERS/Russell Cheyne (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup player Hunter Mahan (R) watches his shot on the ninth hole during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 23, 2014. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

The U.S. team line up for a photograph ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 23, 2014. Back row (L-R) Hunter Mahan Jim Furyk, Keegan Bradley, Matt Kuchar, Jimmy Walker, Bubba Watson, Phil Mickelson and Webb Simpson. Front row (L-R) U.S. Ryder Cup player Patrick Reed, Zach Johnson, U.S. Ryder Cup captain Tom Watson, Jordan Speith and Rickie Fowler. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT GOLF)

The U.S. team line up for a photograph ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 23, 2014. Back row (L-R) Hunter Mahan Jim Furyk, Keegan Bradley, Matt Kuchar, Jimmy Walker, Bubba Watson, Phil Mickelson and Webb Simpson. Front row (L-R) U.S. Ryder Cup player Patrick Reed, Zach Johnson, U.S. Ryder Cup captain Tom Watson, Jordan Speith and Rickie Fowler. REUTERS/Phil Noble (BRITAIN - Tags: SPORT GOLF)

U.S. Ryder Cup players Hunter Mahan (2nd L) and Zach Johnson (R) ride in a golf buggy with their caddies during practice ahead of the 2014 Ryder Cup at Gleneagles in Scotland September 22, 2014. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT GOLF)

Attendees walk past PGA and Gleneagles logos while waiting for Ryder Cup team U.S. captain Tom Watson to announce his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF LOGO) 

An attendee walks past U.S. national flags lying on chairs in preparation for Ryder Cup team U.S. captain Tom Watson to announce his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Attendees stand in front of a lit wall while waiting for Ryder Cup team U.S. captain Tom Watson to announce his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Attendees stand in front of a lit wall while waiting for Ryder Cup team U.S. captain Tom Watson to announce his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson smiles after announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson smiles after announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF HEADSHOT) 

Ryder Cup team U.S. captain Tom Watson gestures while announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson gestures while announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson gestures while announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson looks at the Ryder Cup before announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson looks at the Ryder Cup before announcing his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson smiles as he announces that Webb Simpson (on screen) will be one of his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson (C) listens as Hunter Mahan (on screen) speaks about being one of three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson smiles as he announces that Hunter Mahan (on screen) will be one of his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson smiles as he announces that Webb Simpson (on screen) will be one of his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Keegan Bradley, Hunter Mahan and Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Ryder Cup team U.S. captain Tom Watson smiles as he announces that Keegan Bradley (on screen) will be one of his three picks to add to this year's Ryder Cup squad during an event in New York September 2, 2014. United States captain Watson opted for a blend of experience and form in choosing Bradley, Hunter Mahan and Webb Simpson as his wildcard picks for this month's Ryder Cup against holders Europe. REUTERS/Lucas Jackson (UNITED STATES - Tags: SPORT GOLF) 

Hunter Mahan of the U.S. watches his tee shot on the 12th hole during a practice round ahead of the British Open Championship at the Royal Liverpool Golf Club in Hoylake, northern England July 15, 2014. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT GOLF)

U.S. golfer Hunter Mahan hits from the sand on the second hole during the third round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia April 12, 2014. REUTERS/Brian Snyder (UNITED STATES - Tags: SPORT GOLF)

U.S. golfer Hunter Mahan hits his tee shot on the fourth hole during the third round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia April 12, 2014. REUTERS/Jim Young (UNITED STATES - Tags: SPORT GOLF)

U.S. golfer Hunter Mahan hits from the sand trap on the second hole during the second round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia April 11, 2014. REUTERS/Brian Snyder (UNITED STATES - Tags: SPORT GOLF)

U.S. golfer Hunter Mahan hits his tee shot on the second hole during the first round of the 2014 Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia April 10, 2014. REUTERS/Jim Young (UNITED STATES - Tags: SPORT GOLF)

U.S. golfer Hunter Mahan holds his daughter Zoe on the first hole during the Par 3 Contest ahead of the Masters golf tournament at the Augusta National Golf Club in Augusta, Georgia April 9, 2014. REUTERS/Mike Segar (UNITED STATES - Tags: SPORT GOLF)

U.S. team captain Fred Couples and golfing great Jack Nicklaus hold the Presidents Cup during a team picture after the U.S. defeated the International team in the 2013 Presidents Cup golf tournament at Muirfield Village Golf Club in Dublin, Ohio October 6, 2013. Front row L- R: Matt Kuchar, Jason Dufner, Keegan Bradley, Fred Couples, Jack Nicklaus, Bill Haas, Davis Love III, Jay Haas. Top row L- R Steve Stricker, Tiger Woods, Zach Johnson, Webb Simpson, Brandt Snedeker, Phil Mickelson, Jordan Spieth, Hunter Mahan. REUTERS/Jeff Haynes (UNITED STATES - Tags: SPORT GOLF)

U.S. team captain Fred Couples (C) and the U.S. team poses with Presidents Cup during a team picture after the U.S. defeated the International team in the 2013 Presidents Cup golf tournament at Muirfield Village Golf Club in Dublin, Ohio October 6, 2013. L- R, front row: Tiger Woods, Steve Stricker, Zach Johnson, Jason Dufner, Fred Couples, Bill Haas, Hunter Mahan, Jay Haas. Second row L-R: Matt Kuchar, Keegan Bradley, Webb Simpson, Phil Mickelson, Brandt Snedeker, Jordan Spieth, Davis Love III. REUTERS/Jeff Haynes (UNITED STATES - Tags: SPORT GOLF)

U.S. team captain Fred Couples holds the Presidents Cup during a team picture after the U.S. defeated the International team in the 2013 Presidents Cup golf tournament at Muirfield Village Golf Club in Dublin, Ohio October 6, 2013. Front row L- R: Jason Dufner, Matt Kuchar, Keegan Bradley, Fred Couples, Bill Haas, Jay Haas, Davis Love III. Top row L- R Steve Stricker, Tiger Woods, Zach Johnson, Webb Simpson, Brandt Snedeker, Phil Mickelson, Jordan Spieth, Hunter Mahan. REUTERS/Jeff Haynes (UNITED STATES - Tags: SPORT GOLF)