It is becoming a repetitive, vicious cycle: Alex de Minaur starts a grand-slam tournament, results and performances develop, then just as it seems he is finally going to make the breakthrough, he walks on court and fades away.Then he berates himself publicly, questions whether he has what it takes.And the next time he is on the verge of achieving something, he remembers the last collapse, and the previous one, and the one before, and under the burden of expectation and memory, he blows up again.So much of sport is played in the mind, and after his fourth-round Wimbledon exit to Flavio Cobolli, de Minaur's mind is again in a dark place."It's a tough one I either improve or we'll see the same results again and again.The world number six said he would keep fighting, desperately clinging to the hope that things would change."I'm a competitor through and through