Alexander Zverev and Stéfanos Tsitsipás were surprisingly eliminated on Friday in the quarterfinals of the Indian Wells Masters tournament.
Zverev (ATP-4) lost to American Taylor Fritz, while Tsitsipás (ATP-3) had to bow to Georgian Nikoloz Basilashvili.
Zverev won the first set against Fritz in 38 minutes, but then slowly lost his grip on the match.
The global number 39 eventually finished it in the tiebreak of the exciting third set: 4-6, 6-3 and 7-6 (3).
Until this week, 23-year-old Fritz never got past the fourth round at a Masters tournament.
He recorded his eighth win over a top ten player on Friday.
Basilashvili also joined the last four of a Masters tournament for the first time.
The 29-year-old Georgian also needed three sets against Tsitsipás: 6-4, 2-6 and 6-4.
The world's number 36 made many more unnecessary mistakes than Tsitsipás (43 at 24), but he made up for that by also producing more winners than the Greek (31 at 21).
In addition, Basilashvili took four of his five break chances.
Basilashvili will face Fritz in the semifinals on Saturday.
In the other semifinal battle, Bulgarian Grigor Dimitrov will meet Briton Cameron Norrie.
See also: Tennis association investigates Zverev: this is why the German is under fireKeywords: indian wells masters tournament.zverev, alexander zverev, stéfanos tsitsipás, fritz, quarterfinals, tournament, indian wells masters, indian wells, atp-4, georgian, grip, american taylor fritz, atp-3, tennis association, nikoloz basilashvili