CHENNAI, India (AP) Gilles Muller of Luxembourg hit 29 aces in beating last year's runner-up Edouard Roger-Vasselin of France 6-7 (11), 6-1, 7-6 (3) in the opening round of the Aircel Chennai Open on Monday.
The eighth-seeded Muller saved three break points, all in the third set, to wrap up the win in 2 hours, 23 minutes.
Andreas Haider-Maurer of Austria advanced when seventh-seeded Spaniard Marcel Granollers had to retire when trailing 3-6, 7-6 (6), 2-0 due to cramps.
Borna Coric of Croatia needed just 66 minutes to defeat Dutch player Robin Haase 6-2, 6-2.
Defending champion Stanislas Wawrinka has a first-round bye along with the other three top-seeded players, Guillermo Garcia-Lopez, Roberto Bautista-Agut and David Goffin.