Englishman Richard Mansell shares the early clubhouse lead with Spain's Ivan Cantero after day one of the weather-affected Omega European Masters in Switzerland.
With a series of lengthy fog delays throughout the day limiting playing time on Thursday, only eight groups completed 18 holes, with half the field not starting their rounds at all.
Mansell made six birdies and one bogey in his 65 while Spaniard Cantero carded an eagle, four birdies and a bogey to join the lead on five under par.
Home favourite Ronan Kleu and South African Richard Sterne were among a three-way tie for third one shot further back after 13 holes, alongside Italian Guido Migliozzi, who signed for a 66.
Two-time former champion Matt Fitzpatrick, who has three holes to complete when play resumes on Friday, was among those on three under.
There are no Irish players involved ahead of next week's Irish Open.
