Which tennis player won a major tennis championship in singles, Juan Martín del Potro or Bob Bryan?
Bob Bryan Robert Charles Bryan (born April 29, 1978) is an American male professional 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 has been world No. 1 doubles player for much of the last 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.
Billy Martin (tennis) Billy Martin (born December 25, 1956, in Evanston, Illinois, United States), is a right-handed former professional tennis player from the United States. During his career he won 1 singles titles and 3 doubles titles. He achieved a career-high singles ranking of World No. 32 in 1975. Martin currently serves as the head coach for the UCLA Bruins men's tennis team, a position he has held for the past 24 years since 1994. Martin, who played at UCLA, has a 14 straight top 5 NCAA team finishes and a 9 consecutive 20-win seasons. He was named ITA (Intercollegiate Tennis Association) division 1 National Coach of the Year and is a member of ITA Hall of Fame.