Serena Williams rallied to advance to the Western & Southern Open final, beating Caroline Wozniacki 2-6, 6-2, 6-4 on Saturday near Cincinnati. The top-ranked Williams lost a set for the first time in the tournament and committed 41 unforced errors, 20 more than Wozniacki. Williams beat the 12th-seeded Dane for the eighth time in nine career matches.