It's not long since their last meeting which was a pretty close match - one break of serve each.
From todays Observer:
Now Murray has to face another Mayer, and the challenge shifts again. "Going from playing a serve-volleyer to a guy that plays at the back of the court, that can take a bit of time because the points develop completely differently," Murray says. "A majority of the points will be played from the back of the court, but I don't think it will be an issue.
"He's very tough, comes to the net a bit. He has a good slice backhand, but he hits it with two hands, which isn't how normally you're taught to play that shot. He has a very good feel up at the net, hits a lot of drop-shots. He's a pretty flat ball-striker and has huge, looping strokes. It can be tough to time your split step and know when he's going to make contact with the ball. He's caused a lot of guys problems over his career. I'll need to play well to beat him."