Wang's match with No. 1 seed Elina Svitolina was suspended with the Chinese player leading 6-2, 5-2.
The victory, in which she posted 33 winners to 21 unforced errors, will move the 102nd-ranked Yastremska to a new career high ranking in the top 80 when the next rankings are released on Monday.
Next up for the Czech is second-seeded Frenchwoman Caroline Garcia, who beat Taiwanese No. 5 seed Su-Wei Hsieh 6-3, 6-4 in the other semifinal.
"But in the end (Wang) had the advantage, she had the confidence", Svitolina said.
The 2016 Wimbledon girls singles finalist conquered her nerves as she fought back from an early setback to win only her second WTA quarter-final earlier Friday.
Bidding to claim the eleventh career WTA final, the third this season having also lost to Petra Kvitova in Doha, she will meet Qiang Wang or Elina Svitolina.
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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.
"But if before the match you think it s going to be really hard you up your focus, and when you go on court you stay more dedicated to each point, that s what helped me to stay that calm during the whole match".
She became the youngest player in the history of Ukraine, which reached the final of the WTA tournament in singles and won the title.
"At 5-0 down, she had nothing more to lose, so she probably played a little bit more relaxed, and I got a little tight", Garcia said, per the WTA. "Yesterday she was playing really great tennis - I was missing a lot, my game was really off". As reported by our website, if our compatriot will miss the competition this week, she may not qualify for the Final tournament in Singapore in connection with the insufficient number of rating points.
"I was getting myself into too much trouble leaving the balls hanging in the middle of the court", said the Australian.
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