In May, del Potro had to retire again, this time in a first-round match against Andy Murray at the Rome Masters. During the second set, the Argentine allegedly made derogatory comments about Murray's mother which resulted in a complaint to the umpire. Del Potro's serve was subsequently broken three times in a row, and he suffered a back injury, which caused his retirement. In his second Grand Slam of the year, the French Open, he was eliminated in the second round by Simone Bolelli in four sets. In June, he reached the semifinals of the Ordina Open, losing to eventual winner and top seed David Ferrer in straight sets. For the second year in a row, he was knocked out of Wimbledon in the second round; he won his first-round clash with Pavel Šnobel in straight sets, but then lost to Stanislas Wawrinka.