Novak, the pacifier!
I think this is how this scenario would pan out:
Federer would start blowing the guys out left, right and centre, but when it'll come to killing the match off, he'll all of a sudden lose his powers and let the opponent back in and when it goes the whole distance he'll choke and lose.
Nadal will fake an injury and ask for a time out from the ref, before doing a quick sucker punch on 2/3 opponents and start moving like a beast and beat every one up.
Murray will come out and be very defensive, dodging punches and couter attacking but his downfall will come when he tries getting aggressive, misses a few punches and while too busy berating himself, get himself knocked out.
Novak will start throwing Gluten-free food at everyone and because of how bad it tastes, everyone will run away, rendering Novak the winner.
Against the use of violence, still winning fights.
Now that I think about it, I think it's pretty clear that Murray would get his ass kicked.