"I actually hit with Ricardas a lot," said Murray. "I trained with him before the Australian Open last year.
"I practised with him in Brisbane and I practised with him a couple times before the tournament here. He is not that tall and he hits the ball pretty big from the back of the court.
"He plays aggressive. He's a very flat hitter of the ball. And he's obviously playing well to beat a guy like Mayer that comfortably. It was a very good win."
Bernakis has never progressed beyond the third round of a Grand Slam.