Berankis, 22, trained with the British number one ahead of last year's tournament, where he failed to progress beyond the qualifying rounds.
"I am just going to try my best, playing the top players is always tough," said Berankis. "I will have to do everything as well as possible. If everything goes well we will see.
"I feel calm. I have practised with him so it's not going to be a big surprise to see Andy Murray on the other side of the net.
"The first time [you practise with a top player] it's like 'wow', but after a while you just calm down and play your own game. I think it's an advantage that I am used to him. I am feeling confident at the moment, that's for sure."
Berankis overcame 25th seed Florian Mayer in straight sets in round two.