Which German tennis player holding 13 Masters Series titles and an Olympic gold medal attended the 1997 Wimbledon Championships in London? 
1997 Wimbledon Championships: The 1997 Wimbledon Championships was a tennis tournament played on :grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon in London in England. 1997 Wimbledon Championships:  Ten of the thirteen surviving eligible champions attended: Louise Brough, Rod Laver, Margaret Court, Billie Jean King, John Newcombe, Chris Evert, Martina Navratilova, John McEnroe, Boris Becker and Pete Sampras. Boris Becker:  He also won five year-end championships, 13 Masters Series titles, and an Olympic gold medal in doubles.
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