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John Isner at Roland Garros in 2010.
John Isner's claim to Grand Slam fame came at Wimbledon in 2010, when his first round match lasted 11 hours and five minutes.
He joined the ATP World Tour in 2007, after playing tennis for the University of Georgia and made his Davis Cup debut in 2010, excelling in doubles, going 2-0.
He has a career-high ranking of No. 18 and won his first singles title in 2010, in Auckland.
In 2009, he showed promise on the clay, making it to the quarterfinals, losing to fellow countryman, Wayne Odesnik. He had to withdraw from Roland Garros that year, due to mononucleosis.
His most recent tournament win came last week in Rome, when he teamed up with Sam Querrey.
Their opponents in the final, Andy Roddick and Mardy Fish, had to withdrawal after Roddick sustained an injury to his right shoulder. Isner and Querrey were finalists in another clay court tournament this year, in Houston.
Also known as "Quisner," Isner and Querrey are currently ranked No. 34 and No. 36, respectively, according to the ATP World Tour website.