Great Britain's Emma Raducanu moved through to the quarter-finals at the Korea Open by beating China's Yue Yuan in straight sets.
Raducanu, 21, seized control of the match by winning six successive games to wrap up the opening set and then take charge of the second.
The 2021 US Open champion, ranked 70th in the world, eventually took her seventh match point to win 6-4 6-3 and reach the last eight in Seoul.
Raducanu will play Russian top seed Daria Kasatkina or American Hailey Baptiste for a place in the semi-finals.
Yue, the world number 40, recovered an early break in the opening set but Raducanu landed another blow in the ninth game before taking her first set point on serve.