Novak Djokovic beats Russia's Ivan Gakhov 7-6 (7/5), 6-2 in 1h47. Two-time defending champion Stefanos Tsitsipas benefited from the abandonment.
Zverev was back on clay after his injury in the semifinals of Roland-Garros last year. Bonzi (48th), although right-handed, had to forfeit after only 22 minutes of play against Tsitipas (3rd). Ugo Humbert, who went through qualifying, also gave up not without having four match balls.