Novak Djokovic retains U.S. Open title , beating Rafael Nadal in Sunday 's final . Nadal had toppled Serbian from world No . 1 ranking by reaching the title match . Serena Williams gets revenge for his defeat by Nadal in last month 's China Open final . The world No . 1 crushed formerly top-ranked Jelena Jankovic 6-2 6-2 despite suffering an apparent recurrence of a back problem from earlier in the tournament . Jelena Jankovic wins 56th title of her career , beating Jelena Jankovic in women 's final .
Novak Djokovic retains U.S. Open title , beating Rafael Nadal in Sunday 's final . Nadal had toppled Serbian from world No . 1 ranking by reaching the title match . Serena Williams gets revenge for his defeat by Nadal in last month 's China Open final . Jelena Jankovic wins 56th title of her career , beating Jelena Jankovic in women 's final .