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by Steve Tignor

Justine Henin vs. Serena WilliamsWomen's QF: Court Philippe Chatrier — 2nd match
They just get better. We’ve been waiting for four years for this, and it comes at a good time, because both women appear to be at or near their best. I’ve picked Justine by a nose, and I don’t see any reason to change that…except...after the first set of her first match Serena found her range and hasn’t lost it. You can usually count on it to come and go for her over the course of an event. She handily beat the No. 10 seed, Dinara Safina, Saturday. Serena will also be motivated to avenge her loss to Henin here in 2003. And we all know what Serena’s like when she’s avenging something. So why am I picking Henin? Um…well, I don't...ok, she’s the two-time defending champion, she’s the best on clay, nobody moves around the dirt as well as she does, and she was literally an inch from beating Serena in Key Biscayne this spring.

Prediction: Henin

Maria Sharapova vs. Anna ChakvetadzeWomen's QF: Court Suzanne Lenglen —2nd match
You’ve got a contrast in Russians in this one. The big-hitting, big-screeching “cow on ice” Sharapova faces the demure and soft-handed Chakvetadze, a young Top 10 player looking to reach her first Slam semi. As with Patty Schnyder, Sharapova can’t match her opponent’s hands or court sense. But no one in the WTA can match Sharapova’s desire. It might hurt us to hear it—and that last match was pretty painful—but Maria and her father will do whatever it takes to win, and that fact has got to be worth two or three games alone. Sharapova has never lost to Chaks, she beat her in two close sets in Australia this year, and the fact that she just saved a match point in her last round will help her if she gets down Tuesday. Clay may not be Sharapova's surface, but Chakvetadze is better on hard courts as well. I’ll take Sharapova in three, but I’m looking forward to seeing what Chakvetadze can do with her understated counterpunching.

Prediction: Sharapova

Nikolay Davydenko vs. Guillermo CañasMen's QF: Court Suzanne Lenglen — 3rd match
How much do you love dirtball? This is the question you must ask yourself before you settle in for this one, because you’re going to get a lot of it. Both guys can hit and run all day, all night, and then the next morning if need be—hell, this may never end. It’s also a tough one to call. Each is playing well and winning convincingly. Davydenko is the higher-ranked player and can do more with the ball, but Cañas owns a 3-1 record against the Russian, he won their only meeting on clay (though they haven’t played since 2005), and, most important, he will never stop grinding. Never. Still, I liked the way Davydenko was sticking and moving last week, so I’ll take him in four arduous sets.

Prediction: Davydenko