Yoda and Revan would take an eternity if you ask me, both are great fighters. Both are smart both know what they are doing. I think Revan is more powerful but Yoda is hard to kill if not impossible. Revan would need a shit load of time to pull that one off.
Then you have Malak vs Mace, which Malak will win IMO. He has more experience and is just like Mace a legendary dueller. Difference is however that Malak is that in a time of war and Mace in a time of peace.
Now Personally I think Malak will take care of Mace then join Revan and together they will take out Yoda.