Wozniacki advanced into the fourth round at the U.S. Open with 6 - 2 6 - 4 win over Vania King . Danish player is seeking her first grand slam title . But Williams , seeded a lowly 28th after injury and illness , kept her nerve to go through . Serena Williams defeated Victoria Duval in straight sets to reach last 16 .
Wozniacki advanced into the fourth round at the U.S. Open with 6 - 2 6 - 4 win over Vania King . Danish player is seeking her first grand slam title . Serena Williams defeated Victoria Duval in straight sets to reach last 16 .