Argentina’s Juan Martin del Potro wins against Spain’s Fernando Verdasco after three sets in the group stage of tennis’s ATP finals in London. The score was 6-4, 3-6, 7-6 (7-1).

In an interview, Del Potro says, “It wasn’t easy, (but) I’m very happy, it’s great.”

Del Potro will be playing against Federer later this week while Verdasco moves on to face Murray for the final Group A matches in the ATP Tennis Tournament.