The 19-year-old World No.98 from Mumbai made his breakthrough in the semi-finals where he downed two-time champion Jan Koukal, the top seed from the Czech Republic expected to make his fourth final appearance in six years, 13-11, 11-8, 9-11, 7-11, 13-11 in 98 minutes.
Third seed Mangaonkar Saturday lined up against defending champion Greg Lobban, the No.2 seed from Scotland who was celebrating his third successive appearance in a Tour final.
Despite his heroics less than 24 hours earlier, the Indian teenager was still able to call upon reserves to recover from losing the first game to take a 2-1 lead.
Edinburgh-based Lobban, ranked 82 in the world, dug deep to take the fourth to force a fifth game decider.
But Mangaonkar refused to give up, reclaiming the advantage to close out the match 7-11, 11-8, 11-4, 6-11, 11-7 after 77 minutes to take the title.
"The turning point of this final was in the second set where I started to move properly on the court," said the jubilant champion after the second Tour title triumph of his career.
"I was happy to win the third, rested a bit in fourth and fought back in fifth. Squash is also a mental game and I gave it all I had in the final set."
--IANS (Posted on 16-12-2013)