Federer comes through late-night slugfest in Paris

Swiss great Roger Federer reached the last 16 of a Grand Slam for a record-extending 68th time after defeating Germany's world No 59 Dominik Koepfer 7-6 (7-5) 6-7 (3-7) 7-6 (7-4) 7-5 in a late-night slugfest at the French Open.