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.
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