MELBOURNE, Australia (AP) -- The first two women's matches were over quickly, with No. 2-ranked Maria Sharapova finishing off a 6-0, 6-0 win over Olga Puchkova in 55 minutes. She showed no signs of discomfort from a right collarbone injury that ruled her out of a tuneup tournament in Brisbane.
Sharapova has a potential third-round match against Venus Williams, who needed just an hour for her opening 6-1, 6-0 win over Galina Voskoboeva of Kazakhstan.
No. 4 Agnieszka Radwanska, No. 6 Li Na, No. 9 Samantha Stosur, No. 11 Marion Bartoli and No. 13 Ana Ivanovic all won in straight sets, and 17-year-old American Madison Keys joined them in the second round when she beat Casey Dellacqua of Australia 6-4, 7-6 (0).
Venus Williams missed the 2012 Australian Open. She is returning from a seven-month layoff because of Sjogren's syndrome, an illness that causes joint pain and fatigue.
"It's hard to play the first match in a major, first thing of the year, and that can be a lot of pressure," Williams said. "I did my best."