Also, Neha Uberoi served 11 aces and 12 double faults in beating fellow American Lisa Raymond 6-3, 3-6, 6-1, Bogota champion Lourdes Dominguez Lino defeated Ukraine's Viktoriya Kutuzova 6-3, 7-5, and Ukrainian qualifier Alona Bondarenko defeated Russian Ekaterina Bychkova 6-1, 7-5 to line up a match with Petrova, who won the Amelia Island title on Sunday.
Second-seeded Gaston Gaudio and former champion Fernando Verdasco won in straight sets to reach the second round of the Valencia Open on Monday.
Gaudio, the 2004 French Open champ, withstood 10 aces by Raemon Sluiter of the Netherlands to prevail 7-6 (6), 7-6 (3) in 1 hour, 54 minutes.
The Argentine won five claycourt titles last year and a career-best 42 matches on the dirt, but he's only off to a 6-3 start this year, with a best result to Acapulco's semifinals.
Verdasco, the champ in 2004, defeated Spanish countryman Alberto Martin 6-3, 6-4.
In other first-round matches, Boris Pashanski of Serbia and Montenegro beat 2002 French Open champ Albert Costa 3-6, 6-3, 6-4, Guillermo Garcia-Lopez beat Feliciano Lopez 6-3, 6-3 in another all-Spanish encounter, and Florian Mayer of Germany ousted Guillem Burniol of Spain 6-0, 6-3 to next face Gaudio.
Defending champion Igor Andreev was to open yesterday against fellow Russian Marat Safin, who will play his first match on clay since last year's French Open.
Also, top-seeded Nikolay Davydenko will begin his European claycourt season against Czech Jan Hernych.
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