Alexander Zverev says personal issues have affected his play in recent weeks, including changes to his team.

The German split with his agent, Patricio Apey, saying it required a lot organizing and communication.

"This story with my manager took a lot from me," he said, speaking to press at Munich. "It's why the focus has been bit gone for a few weeks. But now, it calms down a bit."

The 22-year-old German has not won consecutive matches since Acapulco. He will also not have a coach in Munich, with both Ivan Lendl and his father elsewhere this week.

But he is still positive about starting a turnaround, saying he just needs a few tight wins.

"If you can get by this phase, I think, you will be even better," he said. "It's important that I find my game again."

Zverev is the defending champion and top seed at Munich.