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.
Ivan Lendl Ivan Lendl (] ; born March 7, 1960) is a retired tennis player originally from Czechoslovakia who became a United States citizen in 1992. He is often considered among the greatest in the sport's history. He was the world No. 1 for 270 weeks in the 1980s and finished his career with 94 singles titles. At the majors he won eight titles and was runner-up a record 11 times. He also won seven year-end championships and a record 22 Grand Prix Super Series titles.