Former Massachusetts Governor and two-time presidential candidate Mitt Romney (R) fights five-time heavyweight champion Evander Holyfield during their boxing match in Salt Lake City, Utah May 15, 2015. The two boxed to benefit the medical charity CharityVision. REUTERS/Jim Urquhart TPX IMAGES OF THE DAY

Boca Juniors' fans climb onto the tribune fence as they cheer their team on before their Copa Libertadores soccer match against River Plate in Buenos Aires May 14, 2015. REUTERS/Marcos Brindicci TPX IMAGES OF THE DAY

Football - Manchester United v Arsenal - Barclays Premier League - Old Trafford - 17/5/15
Son of Manchester United's Wayne Rooney, Klay with mascot Fred the Red during a lap of honour after the game
Reuters / Phil Noble

Football - Liverpool v Crystal Palace - Barclays Premier League - Anfield - 16/5/15
Liverpool's Steven Gerrard poses on the pitch with his family after his final game at Anfield
Reuters / Phil Noble

Yamaha MotoGP rider Jorge Lorenzo of Spain celebrates next to second-placed Yamaha MotoGP rider Valentino Rossi (L) of Italy after winning the French Grand Prix at the Le Mans circuit, in Le Mans, France May 17, 2015. REUTERS/Stephane Mahe TPX IMAGES OF THE DAY

Maria Sharapova of Russia poses for photographers as she holds her trophy after winning the final match over Carla Suarez Navarro of Spain at the Rome Open tennis tournament in Rome, Italy, May 17, 2015. REUTERS/Stefano Rellandini TPX IMAGES OF THE DAY

Brazil's Corinthians fans cheer their team on during Copa Libertadores soccer match against Paraguay's Guarani in Sao Paulo May 13, 2015. REUTERS/Paulo Whitaker

A security attempts to stop a supporter of Dnipro Dnipropetrovsk who ran onto the pitch to celebrate the victory over Napoli in the Europa League semi-final second leg soccer match at the Olympic stadium in Kiev, Ukraine, May 14, 2015. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY

A referee falls over Canada's Dan Hamhuis during the Ice Hockey World Championship final game between Russia and Canada at the O2 arena in Prague, Czech Republic May 17, 2015. REUTERS/Laszlo Balogh TPX IMAGES OF THE DAY

Real Madrid's captain Felipe Reyes raises up the trophy after winning their Euroleague Final Four final basketball game against Olympiakos in Madrid, Spain, May 17, 2015. REUTERS/Sergio Perez TPX IMAGES OF THE DAY

Barcelona players celebrate after winning the Spanish first division title following their soccer match against Atletico Madrid at at Vicente Calderon stadium in Madrid, Spain, May 17, 2015. REUTER/Juan Medina TPX IMAGES OF THE DAY

Canada's players celebrate defeating Russia in their Ice Hockey World Championship final game at the O2 arena in Prague, Czech Republic May 17, 2015. REUTERS/Laszlo Balogh TPX IMAGES OF THE DAY

Football - Manchester United v Arsenal - Barclays Premier League - Old Trafford - 17/5/15
Manchester United's David De Gea saves from Arsenal's Olivier Giroud
Action Images via Reuters / Jason Cairnduff

Football - Sunderland v Leicester City - Barclays Premier League - Stadium of Light - 16/5/15
Sunderland's Sebastian Coates and Leicester's Leonardo Ulloa in action
Action Images via Reuters / Ed Sykes

Sasha Kutsenko from Ukraine performs a dive during the FINA High Diving World Cup in Cozumel, Mexico, May 10, 2015. REUTERS/Victor Ruiz Garcia TPX IMAGES OF THE DAY

Britain's Prince Harry grimaces after heading the ball as he plays in a 5-a-side soccer game with boys from the Western Springs football club at a FIFA U20 World Cup event in Auckland, New Zealand, May 16, 2015. REUTERS/Nigel Marple TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY

Football - Manchester United v Arsenal - Barclays Premier League - Old Trafford - 17/5/15
Manchester United's Radamel Falcao heads at goal as Arsenal's Laurent Koscielny challenges
Action Images via Reuters / Jason Cairnduff