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Regardless of the results of this week's year-end championships in Istanbul, there is no true world No. 1 in tennis this year.

While Serena Williams, one of the best players of all time, is riding the wave of an incredible comeback, Sam Stosur's chances are slim.

Saturday's semifinal between three-time champ Serena Williams and world No. 1 Caroline Wozniacki is the most anticipated women's match of the summer.

"Caroline in the City" has been renewed for another round. Wozniacki defeated Andrea Petkovic in straight sets to advance to the semis, where she'll face Serena.

She says the criticism of her game doesn't bother her. And Caroline Wozniacki is fighting like a player who feels comfortable at No.1.

The quarters feature such familiar names as Williams, Wozniacki and … Angelique Kerber? Introducing two of the lesser-known players in the final eight.

World No. 1 Wozniacki came back from a set and 1-4 down to defeat two-time Grand Slam singles champion Svetlana Kuznetsova.

What's good for the heart is good for your game? Caroline Wozniacki and Rory McIlroy are the latest high-profile couple on the global sports landscape.

The early losses of No. 3 Maria Sharapova, No. 5 Petra Kvitova, No. 6 Li Na and No. 8 Marion Bartoli, above, was one of the themes of week one.

The world No. 1 had no trouble on court, but did not want to discuss the identity of her now coach.

The U.S. Open starts in a week, and world No. 1 Caroline Wozniacki is looking anything but the favorite.

Rory McIlroy is in Cincinnati for Caroline Wozniacki's tournament, and they didn't mind letting the whole Twitter world know.

Women's tennis lacks dominant players and compelling rivalries. Will someone take advantage and emerge as the new star?