NEW YORK :Jiri Lehecka credited a life-changing moment in a hospital during injury rehabilitation for helping him reach his second Grand Slam quarter-final at the U.S. Open on Sunday with a more mature mindset. The Czech 20th seed will face Carlos Alcaraz on Tuesday after defeating Adrian Mannarino 7-6(4) 6-4 2-6 6-2, setting up a rematch with a player he has beaten earlier this year in the last eight at Doha. "Of course, he's one of the two biggest challenges right now in tennis," Lehecka said