Wozniacki lost in the fourth round at the Australian Open as well as the French Open while reaching the third round at Wimbledon and the semifinals at the US Open.

Wozniacki’s best career grand slam result was a semifinal loss last year at the US Open to the eventual champion, Kim Clijsters of Belgium.

The current WTA Tour world number one Serena Williams of the USA however lost only one grand slam match this year at the French Open quarterfinals 6-2, 6-7(2-7), 8-6 to Samantha Stosur of Australia while taking championship grand slam wins at the Australian Open and Wimbledon.

Williams has only recently resumed practicing on the tennis court following a foot injury which has kept her off the tour since Wimbledon.

By comparison, Williams has only played six tournaments this year while Wozniacki has completed in twenty. Williams, who focuses on grand slam tournaments, has until this point this year remained number one despite the fact that she has several zeros factored into her total WTA Tour ranking due to her lack of tournament play because of various injuries.

“Being number one has always been a goal of mine, but right now I am just focusing on winning the next tournament,” Wozniacki said.

The China Open began Friday in Beijing, China.

Head to head Williams leads Wozniacki 2-0 with both wins occurring last year on hardcourts.

Prior to her September semifinal US Open loss, Wozniacki had won 14 matches in a row. But the Dane is winless this year versus elite WTA Tour players Serena Williams, her sister Venus Williams and Kim Clijsters.

Career wise, Wozniacki is 0-7 versus the trio, but remains confident in her abilities nevertheless.

“A few things have happened,” Wozniacki said. “I’ve grown a bit. Not only physically but mentally as well and I feel I can beat anyone now.”