Getty Images
The first set ultimately came down to one break of serve, as the eighth-seeded Berrettini engineered his first of the set on the Norwegian’s serve, and converted it as Ruud missed on a backhand pass before serving the set out to love.
"I think my return today was really a high level. We've played each other already for the fourth time, so I kind of know him in the same way I think he knows me. I didn't expect this performance. You step in the court and you say, 'Okay, I know I can return,' but then you don't know how well you're going to do that."
Berrettini continued to clean up on serve, dropping just three points in the second set as he moved ahead 5-3 with another mid-set break.
"The key I think today was putting pressure on his serve, first serve and second serve. I was always trying to get the momentum and attacking even his first serve. I know that he likes to have time, run around the forehand. I tried to do that. It work out pretty well. I'm happy for that."
Ruud made a brave last stand, saving a match point on his own serve, but couldn’t make in-roads on return as Berrettini rolled to triple match point—pegging the unseeded 22-year-old into a backhand error.
One last big serve put him over the finish line and the Italian will aim to win the biggest title of his career over Zverev, whom he has beaten just once in three total meetings. Their most recent clay-court clash went to the Italian, who won in straight sets at home in Rome.
"I remember that it was tough to return," he said of their last match in Shanghai. "I remember he was serving really well. The times that we played each other in Rome, obviously they were different conditions, I remember in Shanghai I think the roof was closed, the court was very fast, and obviously in Rome it was different. I mean, I remember there was one break each set. I guess he just served better than me and I got broken twice.
"Tomorrow I think it's kind of the same. I saw him, he's playing really good. He's solid. He moves well. For his height, he's really good. He serves well. I mean, he's in the final. He beat Rafa and Dominic, probably the best players on clay."