US Open star Jack Draper has defended Emma Raducanu after Martina Navratilova recently criticised the tennis star. Draper is currently preparing for his semi-final clash with Jannik Sinner as he looks to become the third Briton to win the competition this century. Raducanu, meanwhile, is currently spending some time away from the court following her first round exit last week. Though she played well against Sofia Kenin, she was sent crashing out of the tournament after losing in three sets. Navratilova recently criticised Raducanu, saying she wasn’t as ‘fit’ as she should be – while also urgin…