Robert Charles Bryan (born April 29, 1978) is an American former doubles world No. 1 tennis player. He has won twenty-three Grand Slam titles: 16 in men's doubles and 7 in mixed doubles. He turned professional in 1998. With his twin brother Mike, he was the world No. 1 doubles player for several years, first achieving the top ranking in September 2003. The brothers were named ATP Team of the Decade for 2000–2009. The brothers became the second men's doubles team to complete the Career Golden Slam at the 2012 Summer Olympics.