Jannik Sinner is still regaining his focus on the tennis court after his three-month doping ban. The world No. 1 overcame a brief lapse during the first set of a 6-4, 6-2 victory over No. 93 Dutch qualifier Jesper De Jong in his second match back on tour in front of his home crowd at the Italian Open on Monday.

Jannik Sinner came through the first true test of his comeback from a doping ban with Tuesday's straight-sets win over Francisco Cerundolo which took the world No. 1 into the Italian Open quarterfinals.

World number one Sinner continued his Foro Italico comeback from a three-month doping ban by dealing with De Jong and setting up a clash with Argentina’s Francisco Cerundolo — who defeated Sebastian Ofner 6-2, 6-4 — in the next round.

Italy’s Jannik Sinner serves the ball to Netherlands’ Jesper De Jong during their tennis match at the Italian Open at the Foro Italico, in Rome, Monday, May 12, 2025. (AP Photo/Alessandra Tarantino) Italy’s Jannik Sinner returns the ball to Netherlands’ Jesper De Jong during their tennis match at the Italian Open at the Foro Italico,