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Heather Watson has been knocked out of the Hong Kong Open in the quarter-finals by fifth seed Samantha Stosur.

British number two Watson, 23, took the first set and was a break up in the second but failed to take advantage as Stosur rallied to win 4-6 6-3 6-0.

Watson's capitulation included losing the last 11 games of the match, which lasted just under two hours.

Australian Stosur will face France's Caroline Garcia or German second seed Angelique Kerber in the last four.