Alexei Popyrin exudes confidence ahead of US Open having made big breakthrough | Simon Cambers

It is seven years since Popyrin won the junior title at the French Open, the first Australian to win at Roland Garros in 45 years. That foundation served him well as he made his way on the Tour but for a long time, he found it hard to break through, especially at the biggest events. He has lost in a fifth set seven times at grand slams and he has yet to reach the fourth round. Coach Patrick Mouratoglou, who helped to guide his transition to the professional Tour, said he lacked a little belief. In Montreal, it was clear a switch had been pressed.