The 27-year-old Indian was in top form as he ended his Swiss campaign with a flawless round that included one eagle and four birdies en route to closing with a four-day total of 11-under-par 269 at the Crans-sur-Sierre Golf Club. Lahiri finished in a tie for 13th place.
David Lipsky of the United States, a former winner of the Asian tour Qualifying School, beat Graeme Storm (68) in the first play-off hole for a sensational breakthrough win in his career.
Jyoti Randhawa, who became India's first Asian number one in 2002, closed with a 68 to be tied 21st while Rahil Gangjee, who was among the three Indians that featured in the weekend rounds of the Omega European Masters, signed off with a 73 in 76th place.
Randhawa was also tied 13th at 11-under but a bogey on 16th saw him slip down.
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Lipsky who shot a stunning five-under 65 with six birdies, an eagle and three bogeys drew level with Storm at 18-under. Storm shot 68 in the final round. In the first play-off hole, Lipsky scored four and Storm had a five.
Lahiri said, "I definitely needed this result today as it has been a tough week. I played well but I haven't scored. It was nice to have a bogey-free round today. I felt like my game was turning the corner so I'm happy I managed to do it before I leave here."
"It was very important to pick myself up after the opening 70. I played flawless golf in the first 10 holes where I was three-under and really, I should have played much better right throughout the week.
"But it's my first tournament back and I'm still a little bit rusty. It's nice to have four rounds in and I'm sure I'm going to kick on from here," said Lahiri.