US OPEN 2012 WOMEN'S FINAL: Serena Williams wins fourth U.S. Open title over Victoria Azarenka

No. 4 Serena Williams won the first set and held on in the third to defeat No. 1 Victoria Azarenka 6-2, 2-6, 7-5 on Sunday in the women's singles final of the U.S. Open at Flushing Meadows. Williams continues to dominate after her gold-medal run in the 2012 London Olympics.