I see Ferrer leads Berdych 5-2 in H2H. So, let's imagine:
Ferrer beats Berdych
Berdych beats Murray
Murray beats Djoker
Djoker pulls out, having won some kind of $multimillion bonus. Replaced by Tipsarevic.
Ferrer and Berdych beat Tipsarevic.
Murray beats Ferrer.
That's Ferrer, Murray and Berdych all on two wins. It could come down to sets/games.
oh no it was nail-biting time last time that happened and Andy didn't get through