It may well increase the pressure on him right enough. I happen to know he's never off of Donstalk despite being a Hibee. He loves that thing we do when we serve up pun-fests.
The fact is that Murray is better on grass than any of them so provided he keeps the heid and plays his tennis he should prevail. (At least to the final that is.) But then this is Murray we're talking about. He will feel the pressure and how far he goes will be decided on how well he's learned to handle it.