“I think I've learned a lot from the losses, especially the one here,” he said. “There are some moments where you have to realise what you have done wrong and sometimes it's tough to accept, but this is the right way.”
Since then, he has become the Australian Open champion (beating Daniil Medvedev from two sets down) and only lost his first match of the year in March (that defeat to Alcaraz). It was the first of only two defeats this season.
Alcaraz knows what he is up against. He describes Sinner as the biggest challenge in the sport, saying: “Everything he does, he does it perfectly.”
But Alcaraz is the Wimbledon champion and a former US Open champion. Had he not been felled by nerves in the semi-finals here last year, he could well have beaten Novak Djokovic to reach the final.
They are the two, young superstars of the present who look set to dominate the future. It all begins today.