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Britain number two Heather Watson was made to fight for a place in the quarter-finals of the Hong Kong Open after beating Chinese Taipei qualifier Ya-Hsuan Lee in three sets.
Watson, who fought back from a set down in her opening match, looked to be in cruise control after easing through the first set 6-0. But Lee forced a final set decider after winning a second set tie break 7-6 (7/5).
The Guernsey native, who saved a total of seven break points in the match, secured a crucial break in the third game of the decider before serving out the set 6-4 to win 6-0 6-7 6-4 in two hours and 16 minutes.
Watson will face former US Open champion Sam Stosur after her 6-4 6-4 victory over Puerto Rico's Monica Puig in their second round clash.
Elsewhere, fourth seed Jelena Jankovic eased to a 6-0 6-2 win over Australian Anastasia Rodionova to set up a last-eight tie against sixth-seeded Daria Gavrilova, who beat Spain's Lara Arruabarrena 7-6 (7/4) 6-1.