1) Mace barely
2) Krayt decisively
3) Krayt in a great fight. I always believe this whole notion of "who wins Force wins all out" to be utter retardation, and while Krayt is decisively more powerful, it's not on a tier to drop Mace via sheer power output, ragdoll him, or spam Lightning fast enough to overpower him. However, he can score enough hits that Mace will be too damaged, his combat capacity will go down by a great notch and nullify his small edge as a combatant.
If Mace gets the aid of Canon Depa, she won't change much. If it's Legends Depa, she's enough to tip the scales for Mace to score a decisive win in an absolutely stunning fight.
If Krayt gets the aid of his former self, that's enough to make him win 10/10.