Sixth seed Jo-Wilfried Tsonga beat Luxembourg's Gilles Muller in straight sets to ease into the second round of the ABN Amro World Tennis Tournament in Rotterdam.
Tsonga broke his opponent three times and did not face a single break point on his own serve as he wrapped up a 6-4 6-2 win in just over one hour.
Also in second round action, Martin Klizan beat Germany's Philipp Kohlschreiber 6-7 (5) 6-4 6-1, and Pierre-Hugues Herbet beat fellow qualifier Evgeny Sonskoy 6-2 7-6 (4).
Second seed Dominic Thiem survived the loss of the first set to win his first round match against Germany's Alexander Averev 3-6 6-3 6-4.
Also in the first round, there were wins for third seed David Goffin, fifth seed Grigor Dimitrov and French veteran Richard Gasquet.