“For sure I need to think about changing it up a little more. I may need to be more aggressive,” said Sinner of the struggles with his second serve. “I’ll need to talk to my team about that. He returned very well, especially in the beginning.
“It’s the first time I’ve faced him. He’s already beaten incredible players, so I knew I had to play really, really good,” Sinner continued.
“The first couple of matches are never easy [on grass]. This grass is a little different to Wimbledon. Fabian is an incredible player. It was a tough match and I’m pleased to be in the quarters.”
Sinner, ranked No 1, will play the winner of the match between German Jan-Lennard Struff and Greek Stefanos Tsitsipas, the No 6 seed, next.
The 22-year-old Italian beat Dutchman Tallon Griekspoor (6-7 (8), 6-3, 6-2) in the previous round of the Halle tournament.
In the first round of the Halle tournament, Marozsan, ranked No 45, defeated Russian Roman Safiullin (7-5, 4-6, 6-1).
Halle ATP 500, other second-round results (Owl Arena/Gerry-Weber-Stadion, grass, EUR 2.255.655, most recent results first):
