He is a professional tennis player, and together with his brother Mike they have won 28 titles in doubles, becoming both number 1 in the world.
In 2006 they became one of the few couples that managed to win the 4 titles of Grand slam and the Tennis Masters Cup in his carrer.
They are without a doubt the most outstanding pair of brothers in the history of tennis.
He won a total of 37 titles as a doubles player, of which 34 were in men’s doubles and the other 3 in mixed doubles.
Next to his brother Mike they managed to win 5 Great Slams, 5 ATP Masters Series, two Tennis Masters Cup and 22 ATP Tours.
In the mixed doubles he managed to win 3 Grand slams together with 3 different couples (Katarina Srebotnik, Vera Zvonareva Y Martina Navratilova).
Won 1 time Roland Garros, in 2003, after defeating Paul Haarhuis already Yegeny Kafelnikov in the final by 7-6 and 6-3.
He also won the US Open in 2005, after defeating Jonas Bkorkman already Max mirnyi 6-1 and 6-3 in the final.
He also won the Australian Open twice (2006 and 2007) and the England Open (Wimbledon) in 2006.
In mixed doubles he managed to win 2 times the Australian Open (in 2003 and 2004) and 1 time the US Open (2006)