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With Week 1 of the Australian Open in the books, Serena Williams still looks like the player to beat. But don't rule out Victoria Azarenka or Maria Sharapova, eitiher. Or how about a first-time Grand Slam winner?

With her dominating performance in Madrid, Serena Williams is once again the center of the tennis universe. Her wins over the top two ranked players prove that when she is on, she is unbeatable.

Serena's loss opens up the Australian Open for the rest of the field. Sharapova? Wozniacki? Clijsters? Our columnists disagree on who will take advantage.