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Roger Federer (2003-2010)

The Swiss men's tennis player made his first major splash by winning Wimbledon in 2003 and has gone on two win a record 16 Grand Slam titles, including a career Grand Slam. He held the No. 1 world ranking for a record 237 weeks from the end of 2005 through the 2010 French Open. JOE KLAMAR, AFP/Getty Images