The world number eight, who won a title here in 2011, scored a dominating 7-5 6-2 win in the summit clash, which lasted one hour and 35 minutes.
Roger-Vasselin was trying to win his first ATP title but going past an opponent, who came into the tournament after a phenomenal season, was more than a difficult job.
Wawrinka, in the form of his life, was clearly a superior player. He stood out with his powerful returns and solid ground-strokes, specially his single-handed backhand.
With each passing game, Wawrinka imposed himself more and more on his rival and now leads Roger-Vasselin 2-1 in Head-to-Head record. Roger-Vasselin had beaten Wawrinka three months back at the Swiss Indoors Basel, while the Swiss won in Chennai two years ago.
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"That's (5th title) really big for sure. It is my second title here so I am enjoying. I did my best here. I battled against top-10 in 2013 and I am doing everything (to improve). It's been an amazing first week and I will take this confidence to first Grand Slam," Wawrinka said.
Roger-Vasselin, appreciating the winner, said "It's like a heartbreak to lose in final. Warinka was too good, so he deserves to win. He played amazingly whole week. He was simply too good. Hope next time, I will finally win a tournament.