The third round is when things start to get a little serious, given seeds start running into each other. Darling Kim Clijsters, on a roll and with the Aussie crowd behind her, figures to be tested somewhat against the unpredictable Nadia Petrova on Day 5.

Kim Clijsters (15) versus Nadia Petrova (19): Petrova was in good spirits as she practiced with coach Christian Zahalka on Court 20, nestled parallel to train tracks and well away from the crowds. Intermittent breezes tempered the intense warmth Thursday.

Petrova let out a few smiles as she worked on returns and skied a ball onto another court, proclaiming it was a home run. The 5-foot-10 Russian needs to hit one out of the park to oust Clijsters, riding a nine-match Grand Slam winning streak and coming off a confidence-boosting victory over Justine Henin in the final of the Brisbane International.(source)