Rafael Nadal, winner of a record 13 French Open men's singles titles, is noted for his success on clay; since his debut in 2005, he has only lost twice at the tournament – in 2009 and 2015. Nadal holds the record for the longest winning streak by any male player on a single surface since the tennis open era began in 1968: 81 clay court wins between April 2005 and May 2007. He also holds the record for most titles won on clay in the open era with 56 trophies. Guillermo Vilas won 49 of his 62 singles titles on clay, but only won a single French Open title. Thomas Muster is also considered a successful clay court player; although he also only won the French Open once, 40 out of his 44 career singles titles were won on clay.