PARIS (AP) -- In his first match since returning from a four-month doping ban, Marin Cilic beat Dutch qualifier Igor Sijsling 5-7, 6-1, 6-4 Monday to reach the second round of the Paris Masters.
The Croatian served 22 aces and hit 42 winners to only 17 for Sijsling.
Cilic tested positive for a banned stimulant in May but claimed he had not intended to ingest it in a glucose tablet bought at a pharmacy.
Feliciano Lopez, Lukas Rosol, Robin Haase and Santiago Giraldo also advanced to the next round.
Lopez outlasted Bernard Tomic 6-4, 6-7 (4), 7-6 (1). The Spaniard failed to serve out the match at 5-4 in the second set but he recovered in the tiebreaker of the third set by winning the last six points.
Rosol beat Jeremy Chardy 6-3, 6-4, Haase defeated Denis Istomin 7-6 (8), 6-3, and Giraldo edged wild card Adrian Mannarino 6-3, 2-6, 6-4.