A runner-up to Venus Williams each of the last three years in this final U.S. Open tune-up, Davenport advanced to a quarterfinal meeting with the winner of Wednesday's match between sixth seed Magdalena Maleeva of Bulgaria and Spain's Magui Serna.
In another second-round match, Anna Pistolesi of Israel rallied for a 0-6, 7-6 (7-5), 6-2 triumph over Russia's Vera Zvonareva. Pistolesi has win titles this month in Poland and Finland.
The first round was completed earlier Tuesday, with Maleeva overcoming Thai qualifier Tamarine Tanasugarn, 5-7, 6-4, 6-4.
Elena Dementieva of Russia rolled to a 6-2, 6-4 first-round victory over Silvia Farina Elia of Italy. Dementieva next faces Conchita Martinez of Spain.