Who will win the Roger Federer v. Novak Djokovic men’s semifinal?

“I felt a little bit tired and heavy out there today, but I fought well and stayed really focused, and tried not to lose too much energy on getting frustrated and things like that,” Clijsters said. “Everything has to be better. The serving, the returning, the unforced errors… everything. But I’m in the semifinals and I don’t feel I’ve played my best tennis, so that’s a good thing.”

An injury hit Rafael Nadal at the Australian Open.

Rafael Nadal speaking to the press after losing to David Ferrer in the Australian Open quarterfinals.

On the court in Wednesday quarterfinal action will be (25) Petra Kvitova vs. (2) Vera Zvonareva, and (12) Agnieszka Radwanska vs. (3) Kim Clijsters.

The quarterfinals begin at the Australian Open with Federer v. Wawrinka and Berdych v. Djokovic.

Roddick roasted, Soderling v. Murray ahead?

Sean Randall breaks down the Australian Open fourth round.

“I thought it was over at 4-love,” Tomic said. “Just shows how much he can come back. Against these guys, especially in the Top 10, you can’t afford to lose concentration. That’s the important part. Physically-wise he’s a machine…”

For 90 minutes or so it looked like Andy Roddick was in serious trouble against upstart Robin Haase.

Rafael Nadal doesn’t wear a seatbelt?

Matches to look out for on a loaded Friday in Melbourne include (2) Roger Federer vs. Xavier “X-Man” Malisse, (19) Stan Wawrinka vs. (12) Gael “Force” Monfils, an all-Serb in (29) Viktor Troicki vs. (3) Novak Djokovic, (8) Andy Roddick vs. Dutchman Robin Haase, Kei “Special K” Nishikori vs. Fernando “Hot Sauce” Verdasco, (6) Tomas Berdych vs. (28) Richard Gasquet, and (14) Nicolas Almagro vs. (17) Ivan Ljubicic.

“Every time we played we go the distance, so hopefully we don’t play each other any more,” Federer joked. “It showed what a great mover, return player he is. I wasn’t playing poorly either to lose the third and fourth set, I really think Gilles took it to me, but you remain positive, I worked hard my entire life, I’m happy I won and I’m still in the tournament.”

Remarks on the first round of play in Australia.

Matches to look for Wednesday in Melbourne include (8) Andy Roddick vs. Russian Igor Kunitsyn, Fed nemesis Gilles Simon vs. (2) Roger Federer, Janko Tipsarevic vs. (9) Fernando Verdasco, (6) Tomas Berdych vs. Philipp Kohlschreiber, (16) Mardy Fish vs. Tommy Robredo, Davydenko-killer Florian Mayer vs. Kei Nishikori, (25) Al Montanes vs. the resurgent Xavier “X-Man” Malisse, and (29) Viktor Troicki vs. French dress-wearing Wimbledon iron man Nicolas Mahut.