Serena Williams won the U.S. Open in a comeback Sunday after being just two points away from losing the final to top-ranked Victoria Azarenka of Belarus. But the fourth-seeded Williams managed to pull out the victory, winning the last four games to take the match 6-2, 2-6, 7-5. This is the fourth U.S. Open championship for Williams, and her 15th Grand Slam title overall. Over the last two months, Williams has won Wimbledon, gold at the London Olympics, and now the U.S. Open. The final was pushed to Saturday from Sunday because of rain, and the men’s final was also pushed forward and will take place today. Defending champion Novak Djokovic of Serbia advanced to the final by defeating fourth-seeded Spaniard David Ferrer 2-6, 6-1, 6-4, 6-2 yesterday in a match that had been suspended from a day earlier. Second-ranked Djokovic will play Britain’s Andy Murray, who’s seeded third, for the title, after Murray downed Tomas Berdych of the Czech Republic 5-7, 6-2, 6-1, 7-6 (7) on Saturday.