Stefanos Tsitsipas and Alexander Zverev have been knocked out of the Indian Wells Masters after both lost their quarter-final matches in California.
Greek world number three Tsitsipas lost 6-4 2-6 6-4 to unseeded Georgian Nikoloz Basilashvili.
German Olympic champion Zverev failed to convert two match points in a surprise 4-6 6-3 7-6 (7-3) defeat by American Taylor Fritz.
Basilashvili will meet Fritz on Saturday for a place in the final.
It is the first time either player has reached the semi-finals of a Masters 1,000 tournament.
French Open runner-up Tsitsipas, seeded second, started in sluggish fashion as he dropped the opening set, managing just eight winners to Basilashvili's 14.