Davydenko was anything but sharp in falling 7-6 (7-3), 6-4 to 13th-seeded Andy Murray and Tommy Haas, seeded ninth, dumped Gonzalez 6-3, 6-2 during play Wednesday.
Murray and Haas draw each other in the tournament quarterfinals.
In other matches Wednesday, 12th-seeded Novak Djokovic earned his fourth quarterfinal berth in six tournaments this year with a 6-3, 6-1 rout of Julien Benneteau. His next-round opponent will be No. 14 David Ferrer, who was a 1-6, 6-2, 6-3 winner over Carlos Moya in his fourth-round match.