Jiri Lehecka enters his first US Open quarterfinal, and things are looking up for the Czech pro. At No.21 in the ATP rankings, he’s faced a tough week, battling through Borna Coric, Tomas Martin Etcheverry, Raphael Collignon, and Adrian Mannarino. His next match will test both his aggression and his nerve. Through it all, Lehecka has gained a fresh perspective on his game.

Lehecka exploded onto the tennis scene at 21, making the last eight at only his fifth Grand Slam. He knocked out seeds Cameron Norrie and Felix Auger-Aliassime, sending shockwaves through the tour. Since then, he’s hovered just outside the Top 20. He’s stayed close, still chasing those big wins and hungry for more.

On Sunday, Lehecka thrilled fans again, defeating Adrian Mannarino in four charged sets: 7-6(4), 6-4, 2-

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