WTA Rankings: Serena hits 200th week at No. 1; Ivanovic back in top 10

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Serena Williams begins her 200th week at No. 1 after winning her fourth title of the season at the Bank of the West Classic. Her victory puts her in fifth place for the most weeks spent at the No. 1 spot, trailing Monica Seles for fourth place by nine weeks.

Williams won career title No. 61 -- her first title since the Italian Open in May -- by rallying from 1-5 down in the first set to defeat Angelique Kerber 7-5, 6-3 in the final. Williams also rises to No. 4 in the Road to Singapore rankings, moving past EugenieBouchard (No. 5) and Petra Kvitova (No. 6), while still trailing Maria Sharapova, SimonaHalep and Li Na. 

Serena Williams wins Bank of the West Classic at Stanford

Also making significant moves is Ana Ivanovic, who returns to the top ten after a five-year absence. The former No. 1 hasn't been in the top ten since before the 2009 French Open, but she surpasses Victoria Azarenka this week, after the Belarusian lost in the second round at Stanford. Ivanovic is in the midst of one of her strongest seasons ever after winning three titles in Auckland, Monterrey and Birmingham.

Last week she advanced to the quarterfinals of the Bank of the West Classic, where she was the only player to take a set off Williams all week, losing 2-6, 6-3, 7-5. It was her third three-set match against Williams this season, winning the first at the Australian Open before losing in Rome and Stanford.​

Notable Movers:

• Azarenka falls out of the top ten for the first time since 2010.

• After making her third final of the year, Angelique Kerber moved up to No. 7, passing Bouchard at No. 8.

• After losing in the first round of Stanford to 16-year-old qualifier Naomi Osaka, Sam Stosur falls out of the top 20 for the first time since May 2009.

• Kurumi Nara rose seven places to a career high of No. 33 after advancing to her second final of the season at the Citi Open.

• Varvara Lepchenko was just a point away from making her first career WTA final in Stanford but her run to the semifinals moves her up 13 spots to No. 46.

• Due to a rankings shakeup around her, Victoria Duval, who appears to be doing well in her cancer treatment, moved up to a career high No. 87