Canada's Félix Auger-Aliassime needed to rally from one set and go the distance to handle Germany's Maximilian Marterer in the opening round of the BMW Open.
The 23-year-old from Montreal beat Marterer 6-7(5), 7-6(6), 7-6(3) on Tuesday in Munich.
Auger-Aliassime, the No. 5 seed in the tournament, fired 11 aces, won 78 percent of his first serve points and converted two of eight break point opportunities. He also committed five double faults.
Marterer delivered four aces with two double faults.
Auger-Aliassime will face Taro Daniel of Japan in the second round on Wednesday.
Daniel advanced with a 6-3, 6-4 victory over Australia's Christopher O'Connell.
Auger-Aliassime is the only Canadian player participating in the men's singles tournament.
