Roger Federer stopped No. 1-seeded Novak Djokovic’s ATP World Tour Finals winning streak at 15, beating Djokovic, 7-5, 6-2, on Tuesday in London to reach the semifinals. Djokovic, who has already clinched the year-end No. 1 ranking, had not lost at the Finals since 2011.
Federer broke Djokovic in the last game of the first set and again early in the second. Although Djokovic broke right back, Federer regained the lead a short time later and won the final four games.
In the early match, Kei Nishikori defeated Tomas Berdych, 7-5, 3-6, 6-3.