Germany's Andrea Petkovic reached the second round of the Bank of the West Classic with a 6-1, 6-4 win over Croatia's Alja Tomljanovic on Monday and also benefited from the elimination of an experienced potential opponent in the next round.
Petkovic dropped serve twice but produced six breaks of her own as Tomljanovic struggled on serve, getting less than half her first serves into play.
Petkovic, whose career has been interrupted by knee injuries, will next face 16-year-old qualifier Naomi Osaka of Japan, who defeated former US Open champion Samantha Stosur 4-6, 7-5 (7), 7-5.
Osaka won three straight points to claim the tiebreaker and take the match to a third set, where she trailed 5-3 before breaking Stosur's last two service games.
Karolina Pliskova of the Czech Republic beat Japanese veteran Kimiko Date-Krumm 6-1, 6-3 to set up a second-round match against top-seeded Serena Williams, who had a bye through the first round in her comeback tournament following an illness that ended her run at Wimbledon.
In other first-round matches, American qualifier Sachia Vickery defeated China's Shuai Zhang, 6-1, 6-2 and Varvarel Lepchenko beat Caroline Garcia of France 6-4, 6-3.
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