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Croatia's Marin Cilic celebrates after winning a point against Argentina's Federico Delbonis, during their singles match at the Davis Cup tennis tournament final between the two countries in Zagreb, Croatia, Friday, Nov. 25, 2016. (AP Photo/Darko Vojinovic)

Darko Vojinovic/AP

Croatia’s Marin Cilic celebrates after winning a point against Argentina’s Federico Delbonis, during their singles match at the Davis Cup tennis tournament final between the two countries in Zagreb, Croatia. Photo Darko Vojinovic/AP 

Swiss Freestyle Motocross  driver Mat Rebeaud performs a figure during a FMX jump training session ten days before the 31st Geneva International Supercross, in Payerne, Switzerland, Tuesday, Nov.22, 2016. (Laurent Gillieron/Keystone via AP)

Laurent Gillieron/Keystone/AP

Swiss Freestyle Motocross driver Mat Rebeaud performs a figure during a FMX jump training session ten days before the 31st Geneva International Supercross, in Payerne, Switzerland. Photo Laurent Gillieron/Keystone/AP) 

Britain Tennis - Barclays ATP World Tour Finals - O2 Arena, London - 15/11/16 Austria's Dominic Thiem in action during his round robin match with France's Gael Monfils  Reuters / Stefan Wermuth Livepic EDITORIAL USE ONLY.

Stefan Wermuth Livepic/Reuters

Austria’s Dominic Thiem in action during his round robin match with France’s Gael Monfils during Barclays ATP World Tour Finals at the O2 Arena, London. Photo Stefan Wermuth Livepic/Reuters 

Wrestlers fight during an amateur wrestling match inside a makeshift ring installed on a road organised by local residents as part of the celebrations for the annual Hindu festival of Diwali in Kolkata, India, October 27, 2016. REUTERS/Rupak De Chowdhuri

Rupak De Chowdhuri/Reuters

Wrestlers fight during an amateur wrestling match inside a makeshift ring installed on a road organised by local residents as part of the celebrations for the annual Hindu festival of Diwali in Kolkata, India. Photo Rupak De Chowdhuri/Reuters 

Frankie Dettori celebrates after riding Ardad to victory in the Pepsi Max Flying Childers Stakes during day three of the 2016 Ladbrokes St Leger Festival at Doncaster Racecourse, Doncaster. PRESS ASSOCIATION Photo. Picture date: Friday September 9, 2016. See PA story RACING Doncaster. Photo credit should read: Anna Gowthorpe/PA Wire

Anna Gowthorpe/PA

Frankie Dettori celebrates after riding Ardad to victory in the Pepsi Max Flying Childers Stakes during day three of the 2016 Ladbrokes St Leger Festival at Doncaster Racecourse, Doncaster

Men's 5000m T11 Final - Olympic Stadium - Rio de Janeiro, Brazil - 08/09/2016.  Erick Kiptoo Sang of Kenya leads the pack as he runs with his guide Erick Kiptoo Terer. REUTERS/Ricardo Moraes FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.

Ricardo Moraes/Reuters

Erick Kiptoo Sang of Kenya leads the pack as he runs with his guide Erick Kiptoo Terer in the Men’s 5000m T11 Final during the Paralympics in Rio de Janeiro

Rio Olympics - Closing ceremony - Maracana - Rio de Janeiro, Brazil - 21/08/2016. Performers take part in the closing ceremony.

Kevin Lamarque/Reuters

Performers take part in the closing ceremony of the Olympics in Rio de Janeiro

Brazilian dancers perform at a welcoming ceremony at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Thursday, Aug. 4, 2016. (AP Photo/Robert F. Bukaty)

Robert F. Bukaty/AP

Brazilian dancers perform at a welcoming ceremony at the 2016 Summer Olympics in Rio de Janeiro, Brazil 

People play volleyball on Copacabana beach ahead of the Rio Olympic Games, Brazil. PRESS ASSOCIATION Photo. Picture date: Tuesday August 2, 2016. Photo credit should read: Mike Egerton/PA Wire. EDITORIAL USE ONLY

Mike Egerton/PA

People play volleyball on Copacabana beach ahead of the Rio Olympic Games, Brazil 

Rio Olympics - Olympic Park - Rio de Janeiro, Brazil - 01/08/2016. A divers practices at the Olympic diving venue.

Damir Sagolj/Reuters

A divers practices at the Olympic diving venue in Rio de Janeiro 

RIO DE JANEIRO, BRAZIL - JULY 31:  An aerial view of the Christ the Redeemer statue amidst mist as Rio prepares for the 2016 Summer Olympic Games on July 31, 2016 in Rio de Janeiro, Brazil.  (Photo by Mario Tama/Getty Images)

Mario Tama/Getty

An aerial view of the Christ the Redeemer statue amidst mist as Rio de Janeiro prepares for the 2016 Summer Olympic Games Brazil

Athletes leave the start at the men's half marathon final during the European Athletics Championships in Amsterdam, the Netherlands

Vanden Wijngaert/AP

Athletes leave the start at the men’s half marathon final during the European Athletics Championships in Amsterdam, the Netherlands

reat Britain's Andy Murray kisses the trophy as he celebrates winning the mens singles final against Canada's Milos Raonic at Wimbledon

Tony O'brien/Reuters

reat Britain’s Andy Murray kisses the trophy as he celebrates winning the mens singles final against Canada’s Milos Raonic

Mercedes' Lewis Hamilton celebrates with fans after winning the 2016 British Grand Prix.

Matthew Childs/Reuters

Mercedes’ Lewis Hamilton celebrates with fans after winning the 2016 British Grand Prix

Ground staff clean the order of play boards on day eight of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. PRESS ASSOCIATION Photo. Picture date: Tuesday July 5 2016. See PA story TENNIS Wimbledon. Photo credit should read: Philip Toscano/PA Wire. RESTRICTIONS: Editorial use only. No commercial use without prior written consent of the AELTC. Still image use only - no moving images to emulate broadcast. No superimposing or removal of sponsor/ad logos. Call +44 (0)1158 447447 for further information.

Philip Toscano/PA

Ground staff clean the order of play boards on day eight of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon 

US Track Trials Athletics

AP Photo/Matt Slocum

Sam Kendricks competes the men’s pole vault event at the U.S. Olympic Track and Field Trials, in Eugene Ore

LONDON, ENGLAND - JULY 01: Professional wrestler Magnifico leaps from the ropes of a wrestling ring during a photo call at York Hall in Bethnal Green on July 1, 2016 in London, England. A number of luchadores will perform in 'The Greatest Spectacle of Lucha Libre', which takes place over two days and features Mexican and British stars from the world of Mexican Wrestling. (Photo by Jack Taylor/Getty Images)

Jack Taylor/Getty

Professional wrestler Magnifico leaps from the ropes of a wrestling ring at York Hall in Bethnal Green in London, England. A number of luchadores will perform in ‘The Greatest Spectacle of Lucha Libre’, which takes place over two days and features Mexican and British stars from the world of Mexican Wrestling. 

A member of the ground staff walks on the court cover, as rain delays play on day five of the Wimbledon Tennis Championships in London, Friday, July 1, 2016. (AP Photo/Ben Curtis)

Ben Curtis/AP

A member of the ground staff walks on the court cover, as rain delays play on day five of the Wimbledon Tennis Championships in London

Rugby Union - Rugby Test - England v Australia's Wallabies  - Sydney, Australia - 25/06/16.  Australia's Israel Folau scores a try in the second half.     REUTERS/Jason Reed

Jason Reed/Reuters

Australia’s Israel Folau scores a try in the second half as England play Australia’s Wallabies

Puerto Rico's Monica Puig celebrates winning against Denmark's Caroline Wozniacki (not in picture) during day three of the 2016 AEGON International at Devonshire Park, Eastbourne. PRESS ASSOCIATION Photo. Picture date: Wednesday June 22, 2016. See PA story TENNIS Eastbourne. Photo credit should read: Steve Paston/PA Wire. RESTRICTIONS: Editorial use only, No commercial use without prior permission, please contact PA Images for further information: Tel: +44 (0) 115 8447447.

Steve Paston/PA

Puerto Rico’s Monica Puig celebrates winning against Denmark’s Caroline Wozniacki during day three of the 2016 AEGON International at Devonshire Park, Eastbourne