Federer books pre-quarterfinal berth, to take on Berrettini
Former World No. 1, Switzerland's Roger Federer came through a nerve-wracking third-round match against 27-year-old German Dominik Koepfer 7-6(5), 6-7(3), 7-6(4), 7-5 to seal a spot in the French Open pre-quarterfinals. In the late-evening…