Astana: Stefanos Tsitsipas set up a final against either Novak Djokovic or Daniil Medvedev with a come-from-behind victory against Andrey Rublev in Astana today.
The Greek third seed won 4-6, 6-4, 6-3 to reach his sixth final of the season.
Tomorrow he will face the winner of the second semi-final between Wimbledon champion Djokovic and former world number one Medvedev.
A break in the opening game of the match proved enough to give fifth seed Rublev the first set.
But Tsitsipas, who saved five of six break points in the match, improved as the tie went on and he made his move in the 10th game of the second set to force a decider.
The 24-year-old was rock solid again in the third, wrapping up victory after two hours and 10 minutes to take his head-to-head record against Rublev to 6-4.