Fifth seeded Serena Williams captured her 40th career WTA title by overpowering ninth seeded Czech Lucie Safarova 6-0, 6-1 at the Charleston claycourt tournament on Sunday.

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The 13-time Grand Slam winner needed just 58 minutes to dispatch Safarova in her first final appearance since last year's US Open when she lost to Samantha Stosur.

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"I definitely want to continue this," said Williams who will move from 10 to nine when the new world rankings come out.

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"I've never played consistently at such a high level with low errors like this, and the scary thing is I could have served so much better."

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