Serena Williams won her WTA-leading fourth title of the season Sunday, beating third-seeded Angelique Kerber 7-6(1), 6-3 in the Bank of the West Classic.
The top-ranked and top-seeded Williams won the hard-court event for the third time.
Williams will be No. 1 for the 200th week in her career when the rankings are announced Monday. She is fifth on the career list, nine weeks behind fourth-place Martina Hingis.
Williams beat the left-handed Kerber for the fourth straight time and fifth time in six overall meetings. All of their matches have been in straight sets.
Kerber, 0-4 in finals this season, won five straight games to go up 5-1 and was serving for the first set at 5-2. Williams saved two set points and went on a five-game run of her own.
The eighth-ranked Kerber forced a tiebreaker, where Williams took charge with five straight points to open.