Robert Charles Bryan (Bob) is an American professional tennis player who was born on April 29th, 1978. Bob is the younger twin brother of Mike Bryan. Bob has won 23 Grand Slam titles: 16 in men's doubles and 7 in mixed doubles. With his brother Mike, the Bryan brothers are known for being the best tennis team in doubles in history and he has been the world’s No. 1 doubles player, first achieved the top ranking in September 2003.