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1987 - Steffi Graf replaced Martina Navratilova as the number one tennis player in the Women’s International Tennis Association. The 18-year-old had won eight tournaments in 1987, including the French Open.
I may be mistaken (wouldn't that be a first! :D), but I don't think this is Steffi Graf in this picture. It looks more like another woman tennis player, Mary Pierce. Not that it really matters...