Kenobi can likely hold him off for a good while. It would be a similar fight to him vs RotS Vader, except he wouldn't be as familiar with Maul's moves. He would need a "high ground" moment to pull off a win here.
I agree with even split...Kenobi is crafty enough to find openings and Maul is powerful enough to blitz through a good defense.
__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
Depends. Maul is best off with the saber/darksaber combo. The dual blade lightsaber would hurt his chances.
If the battle takes place in a normal environment, Maul will start off brutal and keep going. Maul has absurd physical attributes, and won't be getting tired like most anyone else would.
However, as soon as Kenobi finds some tactical advantage that suits his stonewall style, he's got it.