Jiri Lehecka earned the biggest win of his career by Pepperstone ATP Ranking Thursday at the Qatar ExxonMobil Open, where he upset World No. 5 Andrey Rublev 4-6, 6-4, 6-3 to reach his second tour-level semi-final.
The 21-year-old Czech entered the clash off the back of straight-set wins against Damir Dzumhur and Emil Ruusuvuori and he demonstrated his confidence levels in a heavy-hitting performance against the top seed.
Lehecka timed the ball cleanly off both wings, causing damage with his flat forehand to hit through a frustrated Rublev. He broke twice, sealing his victory after one hour and 41 minutes to improve to 1-1 in his ATP Head2Head series against Rublev.
"These past two months have been very great for me," Lehecka said in his on-court interview. "I was very looking forward to playing here in Doha on this beautfiul centre court, so I am very happy with the win and looking forward to tomorrow."
The Czech will aim to advance to his first tour-level final when he faces former World No. 1 Andy Murray or French qualifier Alexandre Muller on Friday. Lehecka, who is up eight spots to No. 44 in the Pepperstone ATP Live Rankings, reached the semi-finals in Rotterdam last year.
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