London, England – France's Jo-Wilfried Tsonga prevailed in ending $3.5 million ATP World Tour Finals.
Tsonga earned a 7-6 (7-2), 4-6, 6-3 victory in a match out of Group B that lasted two hours and 43 minutes. Tsonga fired 11 aces and saved five-of-seven break points, but committed six double faults.
He joined defending champion Roger Federer as one of the semifinalists.
Earlier Thursday, Federer set down American Mardy Fish. Federer had already secured a berth in the semifinals and completed Group B play with a perfect 3-0 record after notching a 6-1, 3-6, 6-3 win over Fish.
It was the 37th career victory for Federer at the Tour Finals. That places him in second place on the all-time list ahead of Boris Becker, and just two wins back of leader Ivan Lendl.
Federer, who is looking for a record sixth title here, will face either Novak Djokovic, Tomas Berdych or David Ferrer in the semifinals.
Receive your weekly recap of all the happenings around the world of sports.