third consecutive title in Dubai. Tommy Robredo retired ahead of his quarterfinal match with a strained left adductor muscle, which he suffered during his match against Sam Querrey in the fourth round. His withdrawal allowed Juan Martín del Potro to advance to a masters semifinal after a 17-month hiatus since being a runner-up for the 2009 Rogers Masters Gilles Simon retired after 3–0 loss in the first set suffering from a stiff neck. Roger Federer advanced to semis for the fifth time in Miami. Janko Tipsarević withdrew prior to the semifinal match due to right thigh injury. Due to this walkover scheduled opponent Novak Djokovic claimed his second Serbia Open title. Milos Raonic suffered a back injury and subsequently gave up the match with Fernando Verdasco at the very beginning of the second set while he was one set down, 4–6. Verdasco advanced in the final. The American runners up Mardy Fish and Andy Roddick was forced to step back before the start of the match due to the right shoulder injury of Roddick. Last year finalists Sam Querrey and John Isner won their first Masters title and second overall. Robin Haase gave up the match while being down at second set to 2–0 against Victor Hănescu. He twisted his ankle and as a result he retired from his second quarterfinal of the year (ATP tour level). In the Dutchman's eighth career quarterfinal, he failed for the seventh time to advance. Hănescu has already won one title and will face his second semifinal of the year. Fabio Fognini withdrew after his 5-set match victory over Albert Montañés, which caused him a left leg injury. Ahead of his first French open/Grand Slam quarterfinal against Novak Djokovic he was forced to withdraw resulting in Djokovic keeping his unbeatable record and reaching the semifinals. Andreas Seppi won the final after Janko Tipsarević was forced to retire late in the match due to a right hip injury. The final was originally scheduled to take place on 17 June but due to rain delays it was eventually played on 19 June and moved to Roehampton. References General Specific External links Association of Tennis Professionals (ATP) World Tour official website International Tennis Federation (ITF) official website ATP World Tour ATP Tour seasons