Fans may be divided, but most of them agree that it’s easy to like both players – even if they are polar opposites, and big rivals.
Beth from north of London says she's “gutted” that she has to fly home on Friday morning, thus missing the match. But she weighs in nevertheless.
“I think it’s quite exciting, really, but I am pro Alcaraz I have to say,” she says. “But Sinner’s crept in there. He’s crept up, he’s done really well. So it’s going to be a terrific match – tomorrow’s match is going to be the best of the tournament."
Even though she has to head home, Beth hopes she can see the pair meet in the final at Wimbledon this year.
“I’m going there too,” she says, hopefully.
I will go with Carlos
We next found Adrian, decked out in a snazzy Nadal t-shirt, taking photos with a cardboard cutout of the 14-time champion. He was on his way over to see the statue of Rafa but stopped to give us his thoughts on tomorrow’s showdown.
“I was a fan of Rafa since I was a kid, but now, of course, I am supporting Carlitos,” he said, before confessing: “It’s not the same as with Rafa. If Carlos and Rafa were facing each other I’d have to go with Rafa, but of course tomorrow I will go with Carlos.”
Asked to put on his analyst hat, Adrian didn’t hesitate (a common theme around the grounds):
“I think he can win even if Sinner is now No.1 on the ATP Tour,” he said. “Even if he has not won Roland-Garros yet, it’s easier for Carlos to play on clay than it is for Sinner. His forehand has more topspin than Sinner - Jannik plays more flat.”
Joe from the UK, in Paris to celebrate his birthday, feels an affinity with Alcaraz as well.
“I hope Alcaraz wins,” he said. “He’s not your average guy, he’s out of the box, he’s his own person and he’s a bit like me. He’s fearless, he just goes for it.”
Right then.