The 10th-seeded Sinner has fired 15 aces through his opening three matches at these Championships.
He has won 79% of his first-serve points, has held serve in 51 out of 56 service games, has broken serve 13 times, fired 116 winners and 99 unforced errors.
He spent 8hr 4min in total on court and dropped two sets.
“We have a good relationship,” Sinner said of Alcaraz.
“Sometimes we talk in the locker room. He speaks in Spanish and I speak in Italian, so we talk kind of mixed. But I think we understand us very well. Off court we are friends, we are good friends. I mean, also now after his match and my match, we saw each other in the ice bath. I think we are in a good relationship which hopefully can live for many years because this is the most important.
“Yeah, on court everyone wants to win, so it's hopefully going to be an exciting match.”