Serena Williams’ coach blames knee injury for stunning U.S. Open defeat
Serena Williams shockingly crashed out of the U.S. Open on Thursday, and her coach is blaming a health issue for the defeat. Williams lost 6-2, 7-6 (7-5) to No. 10 seed Karolina Pliskova in the semifinal at Flushing Meadows. The defeat means she will …













