New Zealand's Peter Burling and Blair Tuke sail in the medal race of the 49er class at the London 2012 Olympic Games in Weymouth and Portland, southern England, August 8, 2012. REUTERS/Benoit Tessier

Cycling - Tour de France cycling race - The 113-km (70,4 miles) Stage 21 from Chantilly to Paris, France - 24/07/2016 - Yellow jersey leader Team Sky rider Chris Froome of Britain celebrates with team mates on the finish line. REUTERS/Jean-Paul Pelissier

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 8/7/16 Switzerland's Roger Federer in action against Canada's Milos Raonic REUTERS/Clive Brunskill

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 8/7/16 Switzerland's Roger Federer reacts during his match against Canada's Milos Raonic REUTERS/Clive Brunskill/Pool

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 8/7/16 Switzerland's Roger Federer during a press conference after losing his semi final match to Canada's Milos Raonic REUTERS/Gary Hershorn

Hungary Formula One - F1 - Hungarian Grand Prix 2016 - Hungaroring, Hungary - 24/7/16 Mercedes' Lewis Hamilton and Nico Rosberg celebrate after the race REUTERS/Laszlo Balogh

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 8/7/16 Switzerland's Roger Federer in action against Canada's Milos Raonic REUTERS/Clive Brunskill

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 8/7/16 Switzerland's Roger Federer during a press conference after losing his semi final match to Canada's Milos Raonic REUTERS/Gary Hershorn