Hamilton Tiger-Cats' Bakari Grant catches a pass against Saskatchewan Roughriders' Tarrell Maze (R) during the second half of their CFL football in Hamilton, September 14, 2014. REUTERS/Mark Blinch

Art MotoGP rider Danilo Petrucci of Italy watches his bike skid across the track after losing control of it during the San Marino Grand Prix in Misano Adriatico circuit in central Italy September 14, 2014. REUTERS/Max Rossi

James De La Rosa of Mexico celebrates his victory over Alfredo Angulo of Mexico with a back flip following a middleweight bout at the MGM Grand Garden Arena in Las Vegas, Nevada September 13, 2014. REUTERS/Richard Brian

WBC/WBA welterweight champion Floyd Mayweather Jr. (L) of the U.S. takes a forearm to the throat from Marcos Maidana of Argentina during their title fight at the MGM Grand Garden Arena in Las Vegas, Nevada September 13, 2014. REUTERS/Steve Marcus

The Marina Bay street circuit is illuminated at dusk after a downpour in Singapore September 11, 2014. PREUTERS/Edgar Su

South Africa's Springboks Marcell Coetzee (R) and Handre Pollard tackle New Zealand's All Blacks Julian Savea during their Rugby Championship match at Westpac Stadium in Wellington, September 13, 2014. REUTERS/Anthony Phelps

Spanish rider Alberto Hermoso jumps during a show jumping cross in the Andalusian capital of Seville September 11, 2014. REUTERS/Marcelo del Pozo

Britain's Prince Harry (L) jokes around with former England rugby captain Mike Tindall during the wheelchair rugby exhibition match at the Olympic Park in east London, September 12, 2014. REUTERS/Andrew Winning

Switzerland's Roger Federer serves a ball during his Davis Cup semi-final tennis match against Italy's Simone Bolelli at the Palexpo in Geneva September 12, 2014. REUTERS/Denis Balibouse

A child plays with soccer ball at a refurbished soccer field at the Mineira slum in Rio de Janeiro September 10, 2014. REUTERS/Ricardo Moraes

Sweden's Zlatan Ibrahimovic (L) fights for the ball with Austria's Aleksandar Dragovic during their Euro 2016 qualifying soccer match in Vienna September 8, 2014. REUTERS/Leonhard Foeger

Indian heptathlete Swapna Barman prepares to wear her track shoes before a practice session at Salt Lake stadium in Kolkata August 29, 2014. REUTERS/Rupak De Chowdhuri

Kei Nishikori of Japan lunges for a return to Marin Cilic of Croatia during their men's singles final match at the 2014 U.S. Open tennis tournament in New York, September 8, 2014. REUTERS/Mike Segar

Marin Cilic of Croatia celebrates after defeating Kei Nishikori of Japan in their men's singles final match at the 2014 U.S. Open tennis tournament in New York, September 8, 2014. REUTERS/Shannon Stapleton