Swiss top seed Stanislas Wawrinka was pushed to the wall by his fifth seed opponent Vasek Pospisil before the Canadian retired in the second set with scores at five all.
World No.8 Wawrinka had won the opening set 6-5 and was locked at 5-5 in the next when Pospisil conceded his semi-final match.
In the other semi-final, Vasselin staved off a stiff challenge from Spain's Marcel Granollers to book his maiden final appearance.
The Frenchman broke his opponent in the sixth game of the first set and then held on to his serve in the seventh.
The second set was a different story as Granollers made a spirited comeback and improved his service accuracy and forehand strokes as the game went on, nearly doubling his efforts in the first set.
But the success was short-lived as Vasselin fought back in impressive style.
At the post match briefing, Granollers said, "It was a tough match. I had a chance to win but lost it in the end. I was a little tired from yesterday as my match finished late. However, Vasselin played better than me. He was very aggressive from the start."
World No.52 Vasselin expressed his happiness on beginning the new season with a win.
"Yes, definitely I am happy. One more match to go," he said.
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