Aigle - Italy's Fabio Felline won Tuesday's opening prologue at the Tour de Romandie as race favourites Chris Froome of Britain and American Tejay Van Garderen struggled in the rain.
Trek rider Felline, 27, covered the 4.8km in 5:57 finishing two seconds ahead of Britain's Alex Dowsett (Movistar) with Australian Alexander Edmondson (Orica) seven seconds off the leader.
Three-time Tour de France champion Froome - a two-time winner of the Swiss race - opted to start among the early riders to avoid the rain but his tactics backfired on a slippery surface.
The Sky rider lost 29 seconds to the winner, with BMC's Van Garderen conceding 34 seconds.
The Swiss race is designed to prepare riders for July's Tour de France with Wednesday's stage to Champery over a mountainous route with wintery conditions forecast.
Results from the opening 4.8km prologue of the Tour de Romandie on Tuesday:
1. Fabio Felline (ITA, Trek) 5min 57sec, 2. Alex Dowsett (GBR, Movistar) at 2sec, 3. Alexander Edmondson (AUS, Orica) 7, 4. Maximilian Schachmann (GER, Quick-Step) 8, 5. Victor Campenaerts (BEL, Lotto-NL) same time, 6. Primoz Roglic (SLO, Lotto-NL) 9, 7. Vasil Kiriyenka (BLR, Sky) 10, 8. Tom Bohli (SUI, BMC) s.t., 9. Johan Le Bon (FRA, FDJ) 11, 10. Christoph Pfingsten (GER, Bora) s.t.
78. Chris Froome (GBR, Sky) 29, 108. Richie Porte (AUS, BMC) 33, 113. Tejay Van Garderen (USA, BMC) 34