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Taylor Fritz (left) upset Alexander Zverev after Nikoloz Basilashvili beat Stefanos Tsitsipas
After losing their quarter-final matches in California, Alexander Zverev and Stefanos Tsitsipas were both eliminated from the Indian Wells Masters.
Tsitsipas, the Greek world number three, lost 6-4 2-6 4-4 to unseeded Nikoloz Basilashvili.
Zverev, the German Olympic champion, failed to convert two match point in an unexpected 4-6 6-3 7-6 (7-6), defeat by Taylor Fritz.
Fritz will be meeting Basilashvili on Saturday to secure a spot in the final.
This is the first time that either player has reached the semifinals of a Masters 1000 tournament.
French Open runner up Tsitsipas, seeded 2nd, began slow as he dropped his opening set. He managed just eight wins to Basilashvili's 14.
Tsitsipas, who won the Monte Carlo Masters Masters 1000 title in April, rallied to win the second set.
Basilashvili won the first game and produced some stunning winners to defeat Tsitsipas.
Friday's second quarterfinal saw Zverev serve at 5-3 in the third set. Fritz then hit back with two double faults to give Zverev a crucial break.
The 23-year old eventually won a tie-break which he won to secure his place in the final four.
It was quite shocking, Zverev having won 20 out of 21 of his previous matches on hard courts. He was also looking for his third Masters 1000 title.
The other semi-final will see Cameron Norrie, Britain, taking on Grigor Dimitrov (23rd seed in Bulgaria), who beat Daniil Medvedev, the US Open champion, in the last 16.