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The world No.1 secured a 6-2 6-4 win in an hour and 27 minutes, and will face Alexander Zverev after he beat Alexander Blockx in their semi-final later in the day.

Fils held serve in the opening game of the semi-final, only for Sinner to win the next five games after converting two of a possible three break points.

The Frenchman, who entered this tie on a nine-match winning run after winning in Barcelona last month, lost the first set and saved two break points early in the second.

Sinner was relentless in the Spanish capital, though, conceding zero break points and winning 88 per cent of his first-serve points as he gave little for Fils to work with.

The Italian made the crucial break in the ninth game of the second set, before clinching victory with his first match point.

The 24-year-old claimed his 27th win at Masters 1000 level, having lifted trophies in Paris last year and at Indian Wells, Miami and Monte Carlo in 2026.

Sinner also became only the fourth player to reach the final of all nine ATP Masters 1000 tournaments – after Roger Federer, Novak Djokovic, and Rafael Nadal – and the youngest to achieve the feat.

"Very happy about the general performance today," Sinner said during his on-court interview.

"I am trying to play the best possible tennis I can play, in this moment. Today was a very good day in the office."

Chasing his second clay-court title of the season, the Italian controlled the baseline exchanges and mixed in deft drop shots to hand Fils his first defeat on the surface this year.

"I tried to play very aggressive. I felt very comfortable on return. In [the] second set, he started to serve better, so it became a bit difficult," Sinner said.

"But I knew it before the match, he's one of the best players in the world at the moment. I am very happy I've played against him. It means a lot to me."