Serena Williams serves to Andrea Petkovic, from Germany, during the first set of their semifinal in the Bank of the West Classic tennis tournament in Stanford, Calif., Saturday, Aug. 2, 2014. (AP Photo/Jeff Chiu)
Jeff Chiu
August 02, 2014

STANFORD, Calif. (AP) Serena Williams reached her fourth final of the season by taking the last eight games to beat Andrea Petkovic 7-5, 6-0 on Saturday in the Bank of the West Classic.

The top-seeded and top-ranked Williams is 3-0 in finals so far in 2014, winning titles at Brisbane, Miami and Rome.

The tournament is Williams' first since she tried to play through a viral infection that caused her to lose equilibrium during a doubles match with sister Venus at Wimbledon.

Against the ninth-ranked Petkovic, Williams wasted four break points in the final game of the first set before eventually converting her fifth.

In Sunday's final at the hard-court tournament, Williams will face third-seeded Angelique Kerber, a 4-6, 7-6 (4), 6-2 winner over Varvara Lepchenko.

Petkovic was trying to become the ninth player - and first since 2010 - to beat both Venus and Serena Williams in one tournament. Petkovic eliminated Venus on Friday.

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