World No. 1 Roger Federer beat Paul-Henri Mathieu on Saturday to reach the final of the Swiss Indoors tournament.

Top-seeded Federer hit 10 aces as he beat Mathieu 7-5, 6-4 on the hard court in Basel and reach a record ninth final at the event, which he has won five times.

In Sunday’s final, the Swiss star will meet second seed Juan Martin del Potro, who eased past Richard Gasquet 6-2, 6-2 earlier Saturday.

Federer has a 13-2 head-to-head score against the Argentine, with both losses in 2009, the most notable being the U.S. Open final.

The prize fund for the tournament is €1.4 million.