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Nature Valley Open: Katie Boulter beats former US Open champion Sam Stosur

British number four Katie Boulter beat 2011 US Open champion Sam Stosur to reach her first WTA Tour quarter-final at the Nature Valley Open.

The 21-year-old, ranked 53 places below the Australian, powered to a 7-6 (8-6) 6-1 victory in Nottingham.

It is the latest in a series of promising results for Boulter, who won ITF tournaments in Japan and Portugal earlier this year.

She will face top seed Ashleigh Barty or Duan Ying-ying in the last eight.