Serena Williams' coach admits to coaching during US Open final
Serena Williams' coach Patrick Mouratoglou has admitted to coaching the 23-time Grand Slam champion from the players' box during her US Open final against Naomi Osaka on Saturday. Williams hit out at the chair umpire for issuing her a warning for receiving "illegal coaching". "I am honest, I was coaching. Osaka's coach was coaching every point too," Patrick said.