NEW YORK :American Jessica Pegula rode her roller-coaster season to reach a second straight U.S. Open semi-final with a clinical 6-3 6-3 win over twice Grand Slam champion Barbora Krejcikova on Tuesday. Fourth-ranked Pegula had a dreadful run-up to the year's final major but has flipped the script and found another gear in New York to set up a last four showdown with world number one and defending champion Aryna Sabalenka. "I just surprised myself," said Pegula, who exited early from Cincinnati,