Samantha Stosur has scored a rare win over Maria Sharapova, a spot in the Pan Pacific semi-finals and improved her chances of featuring in the WTA's end of season event after a big afternoon in Tokyo on Thursday.
Holding a 10-1 career record against the Australian, Sharapova was a heavy favourite in their quarter-final but Stosur emerged a 6-4 7-6 (12-10) winner over the two-time champion.
Stosur broke Sharapova to go up 5-3 in the second set but then lost nine straight points as Sharapova sent the match to a tiebreaker, which Stosur won when Sharapova's return was long.
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The win boosts the world No.9's chances of an appearance at the WTA Championships in Turkey which is limited to the top eight ranked players in the world.
Read more: Yahoo Sports