NEW YORK — When Leylah Fernandez wins a pivotal point at the U.S. Open — and she’s won enough of them to become the tournament’s youngest semifinalist since Maria Sharapova in 2005 — the teenager with the exciting game and enthusiasm to match raises her right fist or windmills her arms, firing up herself and the crowd. “It’s really tough …
What often happens next, after good points or bad, is just as important to the success of the unseeded Canadian left-hander with the quick reflexes: She'll turn her back to the court and her opponent, face the wall behind the baseline for a few moments, gather herself and repeat whatever that day's mantra of choice is. “It's really tough to …
