PARIS (AP) Roger Federer returned from the two-set deficit for that seventh amount of time in his career and beat Juan Martin del Potro 3-6, 6-7 (4), 6-2, 6-, 6-3 in the French Open on Tuesday to achieve his record-tying 31st Grand Slam semifinal. Federer already is the owner of 16 major game titles, including at Roland Garros in ’09, but went a lot more than 2 yrs without in addition record total. Del Potro, whose only Grand Slam title came by beating Federer within the 2009 U.S. Open final, was bothered by his heavily wrapped left knee Tuesday. Federer got better because the match advanced. He was virtually perfect within the 4th set, with 13 those who win and zero unforced errors.