Which tennis player won a major tennis championship in singles, Juan Martín del Potro or Bob Bryan?
Juan Martín del Potro Juan Martín del Potro (] , born 23 September 1988), also known as Delpo is an Argentinian professional tennis player who is currently ranked world No. 24 in men's singles by the Association of Tennis Professionals (ATP). His biggest achievement has been winning the 2009 US Open, defeating Rafael Nadal in the semifinal and 5-time defending champion Roger Federer in the final. He was the first to defeat both Federer and Nadal during the same major and was the only man outside the Big Four to win a major between the 2005 French Open and the 2013 US Open, a span of 35 tournaments. He is also the second Argentine and the fifth-youngest man to win the US Open in the Open Era. Other career highlights include winning the bronze medal in men's singles at the 2012 London Olympics and the silver medal at the 2016 Rio Olympics and being part of his country's successful Davis Cup team; but his career has also been hampered by a succession of wrist injuries.
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.