FILE PHOTO: Spain's Rafael Nadal hits a return to Tomas Berdych of the Czech Republic during the men's singles final at the 2010 Wimbledon tennis championships in London, July 4, 2010. REUTERS/Toby Melville
LONDON (Reuters) - A lot has changed since tennis turned professional in 1968, from the colour of the balls to players’ hairstyles and advances in racket and string technology.
But one thing remains the same; winning the French Open and Wimbledon in the same year is still arguably the sport's biggest challenge.
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