Britain's Heather Watson has battled into the second round of the Hong Kong Open, beating China's Kai-Lin Zhang.
The 23-year-old British number two took more than two hours to overcome world number 191 Zhang 3-6 6-1 6-2.
Watson's serve was not on form as she was broken three times in losing the first set and did not serve an ace until the third game of the second set.
She will next play Ya-Hsuan Lee in the second round, a player ranked 184 places below her.
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