ROME — Jannik Sinner is still regaining his focus on the tennis court after his three-month doping ban.
The top-ranked player overcame a brief lapse during the first set of a 6-4, 6-2 victory over Dutch qualifier Jesper De Jong in his second match back on tour at the Italian Open on Monday.
Sinner jumped out to a 4-1 lead but then lost his serve twice as the 93rd-ranked De Jong evened the first set at 4-4.
There were poor drop shots, an inopportune double-fault and other errors from Sinner. But the Italian regained control in front of his home crowd with his powerful groundstrokes and big serve and extended his winning streak to 23 matches, dating back to October.
''I felt like I started the match very well and then I had a big drop,'' Sinner said. ''I tried to understand what was going on. Then fortunately I broke him on 4-all again, which then gave me the confidence to continue.''
Sinner is into the last 16 of his first tournament since he won his third Grand Slam title at the Australian Open in January.
In February, Sinner agreed to the three-month ban in a settlement with the World Anti-Doping Agency that raised some questions, since it conveniently allowed him not to miss any Grand Slams and come back at his home tournament.
The Italian Open is the last big warmup before the French Open starts on May 25.