She added: "It was a really bad performance from me so I was very disappointed that I couldn't play even 20 percent of the game that I can play".
Her subsequent match against No. 4 seed Garbiñe Muguruza of Spain was a different story as Wang needed almost three hours to pull off the 6-7 (5), 6-4, 7-5 comeback victory. Gavrilova was a finalist in Hong Kong past year.
Svitolina would be Wang's highest-ranked top ten scalp this year.
Wang had grabbed headlines at the French Open with her straight-sets demolition of Venus Williams, offering a hint of what was to come, and later overcame Karolina Pliskova in both Beijing and Wuhan.
"I just concentrated on court, point by point", Wang assessed.
Zhang will be favourite to win against 18-year-old Yastremska, now ranked 102.
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The 2016 Wimbledon girls singles finalist fought back from an early setback to win only her second WTA quarter-final earlier Friday.
Svitolina is still in the running for one of the three remaining places at the WTA Finals in Singapore later this month and she now faces an anxious wait to see if a quarter-final finish will be enough to secure qualification. It was her second career title after the Jiangxi Open in July. She's now not entered, but could request a main draw wild card.
Wang had earlier needed just 10 minutes to wrap up her victory against world number five and top tournament seed Svitolina, again sealing the 6-2, 6-4 win with an ace.
"I want to repeat it all from the first match".
"I was feeling it and my legs were a bit exhausted but I'm kind of used to it and this wasn't the reason I lost".
Yastremska, who became the first player born in the 2000s to crack the top 100 earlier this season, reached her first WTA final with a 7-5, 6-4 win over Zhang Shuai of China.
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