Caroline Wozniacki explains Cincinnati's Varvara Gracheva loss.

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Caroline Wozniacki conceded that she "did not play well enough" in her loss to Varvara Gracheva in Cincinnati.

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Former world No. 1 Wozniacki lost in the second round of the Cincinnati tournament against the 45th-ranked Gracheva, 6-4, 6-4.

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Wozniacki was just playing her third match since returning, but Gracheva was thought to be a good opponent for the Dane.

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Wozniacki had nine chances to break serve, but she failed every time because her timing was off."I didn't feel like I played all that well.

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I didn't feel like I was in a groove. None of my nine break points were converted into a win.

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When competing against players of this caliber, that simply won't cut it.

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Last week, I felt quite good about where I was at in life.Unfortunately, I don't feel like my timing is quite where I'd like it to be this week,

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so I'll have to get back to work. I plan to put in some serious time and effort here by working hard and playing lots of tennis.

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