Former champion Amy Frazier made an early exit at the Los Angeles Open, losing 6-2 6-4 to fellow American Jill Craybas in the opening round.
Frazier, making her 16th appearance in the tournament she won in 1994, was blown away in the first set but fought back in the second to 4-5 after trailing 1-3 on Monday.
Both players struggled to hold serve in breezy conditions at the Home Depot Center and the match ended when Frazier double-faulted then netted a forehand after a long rally.
It was their third career meeting, with Frazier having won the previous encounter 6-4 6-1 at Charleston in 2001. Craybas won the first match at Amelia Island 6-2 6-2 the same year.
In other first-round matches, American Ashley Harkleroad beat Chinese qualifier Meng Yuan 6-4 7-6, German Julia Schruff edged Bulgarian Tatiana Poutchek 5-7 6-3 6-3 and Argentine Mariana Diaz-Oliva beat US qualifier Lilia Osterloh 7-6 7-6.
Russian Maria Sharapova, who won the Acura Classic in San Diego on Sunday, is the top seed and gets a bye into the second round where she will meet compatriot Anastassia Rodionova.