Tenth seed Davydenko, who is the only Russian male player left in the tournament, dispatched Stanislas Wawrinka (17) from Switzerland in four sets 6:3, 4:6, 6:3, 6:2 to set up a fourth round head-to-head with eighth seed Fernando Verdasco from Spain.
On form world no 1 Dinara Safina overawed fellow Russian Anastasia Pavlyuchenkova, seeded 27, to win in straight sets 6:2, 6:0 and will now face Aravane Rezai from France.
Also due to play later are former world no one Maria Sharapova, who recently returned to tennis after 10 months out with a shoulder injury, fourth seed Elena Dementieva and Svetlana Kuznetsova (7).
Sharapova will take on another unseeded player, Yaroslava Shvedova from Kazakhstan, while Dementieva faces Australian Samantha Stosur (30) and Kuznetsova has a showdown lined up with Hungary's Melinda Czin.
