The Scot had a 10-4 lead at one stage on Sunday which included a frame where he equalled the joint-highest break in a world final with an impressive 141 clearance at the Crucible.
That was before Englishman Selby showed real fight to get himself back into the contest and finished the last session on Sunday the stronger of the two players, as he managed to wrap up the final three sets.
Six-time world champion Steve Davis has been impressed with the high standard in the final and feels it will be an exciting battle going into the play on Monday.
He told the BBC: "There will be loads of adrenaline pumping for both players, each for different reasons. It's been a fascinating second session. I think by the end of the night they'll have cleared their minds of all of that.
"It was just an astonishing standard by the world champion and world number one in those final three frames. He's superb. You'd expect it, but for a minute there it didn't look like it was going to happen because John Higgins had him on the ropes."