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.
Àlex Corretja Àlex Corretja i Verdegay (] ; born 11 April 1974) is a former professional tennis player from Spain. During his career, he finished runner-up twice at the French Open (in 1998 and 2001). He won the ATP Tour World Championships in 1998 and reached his career-high singles ranking of World No. 2 in 1999. He also played a key role in helping Spain win its first-ever Davis Cup title in 2000. He became a temporary coach of British tennis player Andy Murray in April 2008 for the duration of the clay-court season and resumed the role in 2009. On 29 March 2011, Corretja and Murray parted company by mutual agreement.