Rubin sails through
Fourth seed Chanda Rubin defeated fellow American Alexandra Stevenson 6-2 6-4 to move into the third round.
Rubin has been in excellent form recently and has continued where she left off in Luxembourg last week.
She reached the final of the Seat Open but lost to world number one Kim Clijsters of Belgium.
Also through to the third round is ninth seed Meghann Shaughnessy, who outclassed Ashley Harkleroad 6-3 6-1.
Lisa Raymond also advanced after defeating qualifier Jelena Jankovic 2-6 7-5 7-6.
In first-round matches that were still outstanding, Russia's Nadia Petrova beat American Amy Frazier 6-4 6-0 and Germany's Marlene Weingartner overcame Angela Haynes 6-3 6-4.