he just receives murray's 0-1 record?
No. He's starting at 0-0 like all the others, but only gets to play two matches. He'll end up with 2-0, 1-1, or 0-2. If he wins both matches and Ferrer beats Djokovic and Berdych, he'll go to the semis:
If he wins both, but Djokovic beats Ferrer and Ferrer beats Berdych, it will go to a percentage of sets won. He'll still get through because he'll always have a better set percentage than Djokovic. If he wins at least one of them in straights, he'll top the group.
Tipsy: 2-0 set: 4/4, 4/5, or 4/6
Ferrer: 2-1 set: 5/7, 4/6, 5/8, or 4/7
Djokovic: 2-1 set: 5/8, 4/7, 5/9, or 4/8
All other scenarios in which Tipsy wins both matches have him topping the group.