Li fought off qualifier Urszula Radwanska 6-4, 5-7, 6-1 and Dulko eliminated Lourdes Dominguez Lino 6-2, 6-4. Dulko's victory set up a second-round match against former world No. 1 Jelena Jankovic.
The top 32 seeds in the tournament received byes past the first round.
Alexa Glatch advanced Thursday with a 6-4, 6-1 win over Timea Bacsinszky, earning a meeting with top seed Serena Williams.
Williams has won this tournament five times and has captured the event each of the last two years.
Other winners Thursday included Barbora Zahlavova Strycova, Ekaterina Makarova, Alla Kudryavtseva, Tamarine Tanasugarn, Maria Jose Martinez Sanchez, Mara Santangelo, Tathiana Garbin and Anna-Lena Groenefeld.
Copyright 2009 by United Press International.
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