China's Zhang Shuai looked in ominous form at the Hong Kong Open Friday as she swatted aside last year's runner-up Daria Gavrilova in straight sets - and said she was growing in confidence with every victory.
Wang trailed Muguruza 4-1 in the final set, but showed determination to rally to win the almost three-hour encounter.
Until Sunday, Yastremska s chief claim to fame had been 2016 Wimbledon girls singles finalist, but earlier this year she became the first player born this millennium to break into the WTA top 100 rankings. She's yet to drop a set this week en route to the semifinals.
Svitolina remains in the hunt for WTA Finals qualification despite her quarter-final exit.
"It was (the) toughest game", she said.
Sixth-seeded Wang Qiang of China was leading Svitolina 6-2, 5-2, and serving at 15-30, when their match was suspended until Saturday.
The Hong Kong quarter-final was a rematch of August's US Open third round contest, which the Ukrainian won in straight sets, but here the tables were turned with Svitolina receiving a tennis masterclass from her opponent.
She could still qualify for the WTA Finals, but would have to request and be granted a wild card to play a tournament this coming week to secure a place in Singapore.
In the final four, Wang twice led by an early break in the first set, but was unable to keep her lead and had to battle from behind for the first time this week. "After match point I fell on the floor because I felt so relaxed, that was my instinct to go and lie because I needed to put it away, the emotions".
The teen quickly went down 4-0 to outsider Kristina Kucova ― the world number 317 who knocked out Jelena Ostapenko in the first round ― before recovering to win 7-6 (8/6), 6-2.
"I felt nervous before the first match", said Wang, per the WTA.