Wild-card Alexander Zverev is into the second round of the BMW Open in Munich after beating Benjamin Becker on Monday.
Zverev fired 11 aces in beating his fellow German 4-6 6-1 6-2.
Victor Estrella Burgos is also through to the second round after a 7-6 (7/4) 6-4 win over Viktor Troicki.
Organisers also confirmed that Gael Monfils, the second seed here, has withdrawn due to a knee injury, replaced by Austrian Jurgen Melzer.
Source: PA