Depends, which Anakin, in teh zone, or the other one?
Also, will Ani turn to the Dark Side and become Vader during the fight? That tends to happen when he sees Sidious being attacked by a Jedi......
And if he doesnt, Id say team wins, mainly cuz Marek did a pretty good job of fighting him alone
Kenobi and Ani are pretty much useless if he turns onto one of then and uses the Force..........
I鈥檇 imagine this is Palpatine circa OT.
In this case:
Sabers: The team stomps
Force: Actually, Palpy has a decent chance to win this, and win handily.
All-out: Depends. Palps can win if he鈥檒l launch force attacks from the very start of the fight, and takes care of Anakin and Obi-Wan first. Otherwise the team takes it.
EDIT: If this is RotS Emperor, then he鈥檚 royally screwed.