NEW YORK—Jessica Pegula could do no right at the outset of her first Grand Slam semifinal. Her opponent at the U.S. Open on Thursday night, Karolina Muchova, could do no wrong.
“I came out flat, but she was playing unbelievable. She made me look like a beginner,” Pegula said. “I was about to burst into tears, because it was embarrassing. She was destroying me.”
