At the ATP-500 tournament, held in Astana (Kazakhstan), the first pair of the semifinals were formed by Russian Andrey Rublev and Greek Stefanos Tsitsipas.
Rublev beat Adrian Mannarino of France 6-1, 6-2 in the quarter-finals while Stefanos Tsitsipas beat Hubert Hurkacz of Poland 7-6 (10-8), 6-3.
Other semifinal berths will be contested by Russia's Karen Khachanov against Serbia's Novak Djokovic and Spain's Roberto Bautista Agut against Daniil Medvedev.
The prize fund of the tournament in Astana is $1.9 million.
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