Germany's Maximilian Kieffer birdied three of the last five holes to take the first round lead at the European Masters on Thursday.
His six-under 64 left him one shot clear of Julien Guerrier, Dane Soren Kjeldsen, Andy Sullivan and Japanese Hideto Tanihara.
Kieffer attributed his lowest round in five years to hard work under a new coach.
"I changed coach a couple of months ago now and that work really pays off now. My mind is okay at the moment and the putter so those three things are a good step," he told the European Tour's website.
"It was a good day, I played very good tee to green and holed a few putts so I can’t complain.
“I have played very well the last couple of weeks and have been hitting the ball nicely and the putting feels okay as well, so just trying to stay calm with the mind and hopefully keep the confidence up."
In a tie for third at four under at Crans-sur-Sierre Golf Club were David Drysdale, Nacho Elvira and South African pair Erik van Rooyen and Justin Walters.