Defending champion Kim Clijsters up first

Clijsters is taking on former French Open champ and world No. 1 Ana Ivanovic to start things off today.

Neither woman has been tested much on the way to this fourth round meeting -- Ivanovic, ranked No. 40 coming in, downed No. 21 Zheng Jie in the second round, 6-3, 6-0; Clijsters dropped the first three games to No. 27 Petra Kvitova in the third round, then reeled off 12 straight games.

The opening set is 1-all, both women holding serve after a tough game.