Question: Which German tennis player holding 13 Masters Series titles and an Olympic gold medal attended the 1997 Wimbledon Championships in London? 
Sentence (from "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.
Relevant evidence: Yes