"Since Greek talent Stefanos Tsitsipas and Russia" s Daniil Medvedev have set their clash in the semi-finals, no matter whether Thiem or Berrettini win in the last quarterfinal, this year" s Shanghai Masters will mark the first time in ATP Tour Masters history that all the four semi-finalists were born in the 1990s.
World number six Zverev strengthened his position in the Race To London standings with a 6-3 6-4 win over Italian Matteo Berrettini.
Medvedev has now seen off the 21-year-old - who defeated world number one Novak Djokovic on Friday - in all five of their matches.
"I did say before this year and during this year in the beginning that Sascha (Zverev) was the best in our "Next Gen" group", the world number four said.
"The most important thing is to keep it going as long as I can".
Despite missing a chance to serve out the match at 5-4, Medvedev rallied to a second break and completed the contest in one hour and 36 minutes.More news: Alexei Leonov, first person to walk in space, dies at 85
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One of 26 unforced errors from Djokovic gave Tsitsipas, who produced an array of searing backhand and forehand winners, three break points and he grasped the opportunity to take a 3-1 lead in the third before going on to seal his place in the penultimate round. "I hate myself for putting myself into that kind of situation where I have to play on his own terms and not on my terms", said Tsitsipas.
"I don't mean to be rude at all, but it's just boring. I hope it's just going to be a good match tomorrow".
Zverev, meanwhile, followed up his quarter-final win over Roger Federer with a more straightforward last-four triumph over Matteo Berrettini. Hard court data this year shows the duo having nearly identical service points won numbers, but Medvedev winning nearly 7% more return points - a huge advantage - and given that he's had historical success against Tsitsipas in their previous meetings, all of which are from 2018 onwards, there's a strong case to suggest he's value for a small stake at market lines. "The last few months he's probably the best player in the world".
"He's different this year", Zverev said.
"He had the high-quality tennis and he played well after his serve".
Fabio Fognini had said before his quarter-final loss to Medvedev that the latter was the worst opponent to play at the moment as he was "really dangerous", an assessment that former pro Thomas Johansson agreed with.