Stosur earned a place in the semifinals despite the loss, having won her first two singles matches at the tournament. Dementieva has a 1-1 record after losing to Caroline Wozniacki in her first round-robin match.
Dementieva took a 3-1 lead in the second set before leveling the match with a blistering backhand down the line. Dementieva saved both break points she faced in the third, which went with serve until the tiebreaker.
Story continues below ↓advertisement | your ad hereWozniacki played Francesca Schiavone of Italy later Thursday.
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Wozniacki defeats Dementieva in Pan Pacific finalDi Maria clinches Real deal
