Roger Federer battled into the French Open fourth round after a tense four-set victory over Dominik Koepfer in a tie played inside an eerily-empty stadium and which finished at 12:42 on Sunday morning. Federer, the 2009 champion and probably taking part in his last Roland Garros after a career stretching into its fourth decade, will be in the second week in Paris for the 15th time. His knife-edge 7-6 (7/5), 6-7 (3/7), 7-6 (7/4), 7-5 win over the 59th-ranked German took place at a Court Philippe Chatrier devoid of fans and atmosphere due to a government-enforced Covid-19 curfew. dj/mw