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A cleaner works on Centre Court ahead of play on day three at Wimbledon on July 1, 2015 in London, England. The 129th tournament to be hosted at Wimbledon is due to run for two weeks from Monday 29th June

Carl Court/Getty Images

A cleaner works on Centre Court ahead of play on day three at Wimbledon on Wednesday in London, England

Kai Pfaffenbach/Reuters

A basketball is shot towards the goal post during a women’s group stage 3×3 basketball match at the 1st European Games in Baku, Azerbaijan 

Athletes compete in the men's 3000 meters steeplechase race during the atheltics events at the 1st European Games in Baku...Athletes compete in the men's 3000 meters steeplechase race during the atheltics events at the 1st European Games in Baku, Azerbaijan, June 22 , 2015.  REUTERS/Stoyan Nenov

Stoyan Nenov/Reuters

Athletes compete in the men’s 3000 meters steeplechase race during the athletics events at the 1st European Games in Baku, Azerbaijan

Members of Germany's team compete during the rhythmic gymnastics team qualification at the 1st European Games in Baku...Members of Germany's team compete during the rhythmic gymnastics team qualification at the 1st European Games in Baku, Azerbaijan, June 17 , 2015.     REUTERS/Kai Pfaffenbach

Kai Pfaffenbach/Reuters

Members of Germany’s team compete during the rhythmic gymnastics team qualification at the 1st European Games in Baku, Azerbaijan 

Bolt poses for a portrait in New York...Usain Bolt poses for a portrait in New York June 11, 2015. Sprint supremo Bolt says he is taking his time building up to August's Beijing world championships and is looking forward to an explosive showdown there against American Justin Gatlin. REUTERS/Lucas Jackson

Lucas Jackson/Reuters

Usain Bolt poses for a portrait in New York. Sprint supremo Bolt says he is taking his time building up to August’s Beijing world championships and is looking forward to an explosive showdown there against American Justin Gatlin 

Brazil's Judivan, left, and Diego Poyet of Uruguay compete for a header during their U20 soccer World Cup match in New Plymouth, New Zealand, Thursday, June 11, 2015. (AP Photo/Ross Setford)

Ross Setford/AP

Brazil’s Judivan, left, and Diego Poyet of Uruguay compete for a header during their U20 soccer World Cup match in New Plymouth, New Zealand

28th SEA Games Singapore 2015...28th SEA Games Singapore 2015 - National Stadium,  Singapore - 9/6/15   Athletics - Men's 5000m Final - Indonesia's Agus Prayogo (R) in action during the 5000m Final  SEAGAMES28

Jeremy Lee/Action Images/Reuters

Indonesia’s Agus Prayogo (R) in action during the mens 5000m final at the SEA Games in Singapore 

Participants compete during a bodybuilding contest at a gymnasium in Wuhan...Participants compete during a bodybuilding contest at a gymnasium in Wuhan, Hubei province, China, May 24, 2015. Over 300 people from 22 different Chinese provinces took part in the contest on Sunday, local media reported. Picture taken May 24, 2015. REUTERS/Stringer CHINA

Reuters

Participants compete during a bodybuilding contest at a gymnasium in Wuhan, Hubei province 

Spring weather May 12th 2015...Windsurfers and kitesurfers prepare their kites and boards as near perfect conditions are present at Weston-super-Mare beach on a warm and windy day in the Bristol Channel, Somerset. PRESS ASSOCIATION Photo. Picture date: Tuesday May 12, 2015. Photo credit should read: Ben Birchall/PA Wire

Ben Birchall/PA

Windsurfers and kitesurfers prepare their kites and boards as near perfect conditions are present at Weston-super-Mare beach on a warm and windy day in the Bristol Channel, Somerset 

Al Marmoon Heritage Festival Camel Racing...DUBAI, UNITED ARAB EMIRATES - APRIL 02: Camels race during Al Marmoom Heritage Festival at the Al Marmoom Camel Racetrack on April 2, 2015 in Dubai, United Arab Emirates. The festival promotes the traditional sport of camel racing within the region.  (Photo by Francois Nel/Getty Images)

Francois Nel/Getty

Camels race during Al Marmoom Heritage Festival at the Al Marmoom Camel Racetrack in Dubai, United Arab Emirates

Formula One drivers for the 2015 season are pictured in this combination photo at Melbourne's Albert Park Track...Formula One drivers for the 2015 season are pictured in this combination photo at Melbourne's Albert Park Track, March 12, 2015.   (Top Row, L to R) Mercedes driver Lewis Hamilton of Britain, Mercedes driver Nico Rosberg of Germany, Red Bull driver Daniel Ricciardo of Australia, Red Bull driver Daniil Kvyat of Russia, Williams driver Felipe Massa of Brazil, Williams driver Valtteri Bottas of Finland, Ferrari driver Sebastian Vettel of Germany, Ferrari driver Kimi Raikkonen of Finland, McLaren driver Kevin Magnussen of Denmark and McLaren driver Jenson Button of Britain. (Bottom Row, L to R) Force India driver Nico Hulkenberg of Germany, Force India driver Sergio Perez of Mexico, Toro Rosso driver Max Verstappen of the Netherlands, Toro Rosso driver Carlos Sainz Jr of Spain, Lotus driver Romain Grosjean of France, Lotus driver Pastor Maldonado of Venezuela, Sauber driver Marcus Ericsson of Sweden, Sauber driver Felipe Nasr of Brazil, Marussia driver Will Stevens of Britain and Marussia driver Roberto Merhi of Spain.   REUTERS/Brandon Malone (AUSTRALIA  - Tags: SPORT MOTORSPORT F1)

Brandon Malone/Reuters

Formula One drivers for the 2015 season are pictured in this combination photo at Melbourne’s Albert Park Track, Australia. (Top Row, L to R) Mercedes driver Lewis Hamilton of Britain; Mercedes driver Nico Rosberg of Germany; Red Bull driver Daniel Ricciardo of Australia; Red Bull driver Daniil Kvyat of Russia; Williams driver Felipe Massa of Brazil; Williams driver Valtteri Bottas of Finland; Ferrari driver Sebastian Vettel of Germany; Ferrari driver Kimi Raikkonen of Finland; McLaren driver Kevin Magnussen of Denmark; and McLaren driver Jenson Button of Britain. (Bottom Row, L to R) Force India driver Nico Hulkenberg of Germany; Force India driver Sergio Perez of Mexico; Toro Rosso driver Max Verstappen of the Netherlands; Toro Rosso driver Carlos Sainz Jr of Spain; Lotus driver Romain Grosjean of France; Lotus driver Pastor Maldonado of Venezuela; Sauber driver Marcus Ericsson of Sweden; Sauber driver Felipe Nasr of Brazil; Marussia driver Will Stevens of Britain; and Marussia driver Roberto Merhi of Spain.

Jorge Cazulo...Peru's Sporting Cristal Jorge Cazulo, center, bicycle kicks the ball during a Copa Libertadores soccer match against Venezuela's Deportivo Tachira in Lima, Peru, Tuesday, Feb. 24, 2015. (AP Photo/Martin Mejia)

Martin Mejia/AP

Sporting Cristal’s Jorge Cazulo bicycle kicks the ball during the Peruvian football team’s Copa Libertadores match against Venezuela ‘s Deportivo T├íchira in Lima, Peru 

World Famous Shaolin Monks Come To London's Chinatown...LONDON, ENGLAND - FEBRUARY 23:  Shaolin monks pose for a photograph in Chinatown on February 23, 2015 in London, England. The monks practice Shaolin Kung Fu which is believed to be the oldest institutionalised style of kung fu and are demonstrating their skills while in the UK.  (Photo by Carl Court/Getty Images)

Carol Court/Getty

Shaolin monks pose for a photograph in Chinatown in London, England, on Monday. The monks practice Shaolin Kung Fu, which is believed to be the oldest institutionalised style of kung fu, and are demonstrating their skills while touring the UK 

Judges of the normal hill ski jumping competition look out of windows at the Nordic Skiing World Championships in Falun, Sweden, Friday, Feb. 20, 2015. The individual competition was shifted to later in the day due to heavy winds. (AP Photo/Matthias Schrader)

Matthias Schrader/AP

Judges of the normal hill ski jumping competition look out of windows at the Nordic Skiing World Championships in Falun, Sweden. The individual competition postponed to later in the day due to heavy winds. 

Chinese Kazakh eagle hunters sit on horseback as they travel to a local competition in the mountains of Qinghe County, Xinjiang, northwestern China. The festival, organised by the local hunting community, is part of an effort to promote and grow traditional hunting practices for new generations in the mountainous region of western China that borders Kazakhstan, Russia and Mongolia. The training and handling of the large birds of prey follows a strict set of ancient rules that Kazakh eagle hunters are preserving for future generations.

Kevin Frayer/Getty Images

Chinese Kazakh eagle hunters in the mountains of Qinghe County, Xinjiang, northwest China, travel to a festival organised by the local hunting community to promote traditional hunting practices in the mountainous region that borders Kazakhstan, Russia and Mongolia

Serena of the U.S. celebrates defeating Cibulkova of Slovakia to win their women's singles quarter-final match at the Australian Open 2015 tennis tournament in Melbourne...Serena Williams of the U.S. celebrates defeating Dominika Cibulkova of Slovakia to win their women's singles quarter-final match at the Australian Open 2015 tennis tournament in Melbourne January 28, 2015.     REUTERS/Carlos Barria (AUSTRALIA  - Tags: SPORT TENNIS)

Carlos Barria/Reuters

Serena Williams of the U.S. celebrates defeating Dominika Cibulkova of Slovakia to win their women’s singles quarter-final match at the Australian Open 2015 tennis tournament in Melbourne, Australia

A general view shows the ODI tri-series cricket match between Australia and England in the field as the sun sets at Bellerive Oval in Hobart...A general view shows the One Day International (ODI) tri-series cricket match between Australia and England in the field as the sun sets at Bellerive Oval in Hobart, Tasmania January 23, 2015. REUTERS/Hamish Blair

Hamish Blair/Reuters

A general view shows the One Day International (ODI) tri-series cricket match between Australia and England in the field as the sun sets at Bellerive Oval in Hobart, Tasmania 

Benjamin Becker of Germany signs autographs after defeating Lleyton Hewitt of Australia in their men's singles second round match at the Australian Open.

Issei Kato/Reuters

Benjamin Becker of Germany signs autographs after defeating Lleyton Hewitt of Australia in their second round singles match at the Australian Open in Melbourne

Katsumi Tamakoshi...Competitors run on their arms and legs on a race course in a preliminary race during the Guinness World Record the 100-meter running on all fours at Komazawa Olympic Park Stadium in Tokyo Thursday, Nov. 13, 2014 in celebration of Guinness World Records Day. The 18-year-old Japanese Katsumi Tamakoshi set new record of 15.86 seconds Thursday. (AP Photo/Eugene Hoshiko)

Eugene Hoshiko/AP

Competitors run on their arms and legs on a race course in a preliminary race during the Guinness World Record the 100-meter running on all fours at Komazawa Olympic Park Stadium in Tokyo in celebration of Guinness World Records Day. The 18-year-old Japanese Katsumi Tamakoshi set new record of 15.86 seconds Thursday. 

Russian President Putin poses for a picture with youths who took part in the Nanjing 2014 Youth Olympic Games, as he visits a local Olympic youth sports school in Cheboksary...Russian President Vladimir Putin (C) poses for a picture with youths who took part in the Nanjing 2014 Youth Olympic Games, as he visits a local Olympic youth sports school in Cheboksary, October 9, 2014.

Alexei Druzhinin/RIA Novosti/Reuters

Russian President Vladimir Putin poses for a picture with youths who took part in the Nanjing 2014 Youth Olympic Games, as he visits a local Olympic youth sports school in Cheboksary on Thursday