The Germans trailed, 4-0, in the second set before winning by 7-5 on the strength of four service breaks of their own.
She trailed by 1-5 in the third set and faced two match points before catching Clijsters, 4-6, 6-3, 7-5.
Bobkova won the first set, 6-2, but was trailing by 2-5 in the second set when she walked off the court.
Trailing 1-4 in the final set, he came back to win 8-6.
Trailing by 6-5 in the second set, Moya had to save a match point with a service winner.
Gilbert, who was seeded No. 3, double-faulted twice to trail by 2-5 in the first set.
The Americans never trailed in the second set.
He won the final six games after trailing in the final set 0-3.
Safina trailed by 3-5 in the first set and was struggling with her timing.
Trailing by 3-4 in the second set, Raymond missed an easy overhead.