In the Korea Open semifinal match, top-seeded Ostapenko from Latvia will now take against Emma Raducanu.
Emma Raducanu advanced to the semifinals of the Seoul event on Friday after winning three straight matches for the first time since her US Open victory.
At the Korea Open, the 19-year-old Briton defeated third seed Magda Linette 6-2, 6-2, and will play fellow former major champion Jelena Ostapenko in the semifinals.
The US Open victory by Raducanu last year astonished the tennis world, but she has struggled to build on that success, and her Grand Slam defence ended in the first round last month.
In destroying Poland’s Linette in 77 minutes, Raducanu, who had a career-high ranking of 10 in the world in July but is currently ranked 77th, displayed glimpses of her Flushing Meadows greatness of 2021.
Sixth-seeded Raducanu got the match going right away, winning the first four games to take the opening set 6-2.
In the second set, she maintained her lead, and the only moment she faltered was when her opponent needed a protracted medical break.
In Seoul, the resurgent Raducanu has not yet released a set.
But the top-seeded Latvian Ostapenko, who won the 2017 French Open, will be a difficult test for her.
In their quarterfinal match, she crushed Victoria Jimenez Kasintseva, who was ranked 186th, 6-2, 6-1.
Tatjana Maria of Germany and Ekaterina Alexandrova of Russia will face off in the other semifinal.