Former world No 7 Gael Monfils came from behind to take victory over Benjamin Becker in the second round of the Heineken Open in Auckland on Tuesday.
The mercurial Frenchman displayed flashes of brilliance as he defeated Becker 6-7 6-3 6-4, showing his comeback from injury was firmly on track.
Monfils, who suffered a knee problem that plagued most of his 2012 season, said: "It was tough. I tried to do my best (but) sometimes I'm on and off, but it's my first game and I try to do my best."
Meanwhile, world No 373 Greg Jones showed his worth as he achieved his first win in five ATP matches to dispose of sixth seed Jurgen Melzer in straight sets.
The Australian said: "It's a pretty good feeling. I trained really hard during the off-season. Physically, I'm just feeling much better on the court."
In other first round matches, Colombian Santiago Giraldo thrashed Go Soeda of Japan 6-1 6-0, Slovak Lukas Lacko beat Italy's Paolo Lorenzi 6-3, 6-3 and Holland's Igor Sijsling produced a 3-6 6-3 7-5 win over compatriot Robin Haase.
Canadian Jesse Levine made short work of New Zealand wild card Daniel King-Turner, strolling to a 6-2 6-2 win, while Lu Yen-Hsun of Taiwan beat France's Benoit Paire 6-3 2-6 6-2.
Defending champion and top seed David Ferrer of Spain will play for the first time on Wednesday after receiving a bye into the second round, along with Philipp Kohlschreiber and Tommy Haas, seeded two and three respectively, and American fourth seed Sam Querrey.