Austria's Matthias Schwab and France's Mike Lorenzo-Vera carded bogey-free 63s to set the clubhouse target on day one of the European Masters in Crans Montana, Switzerland, on Thursday. Finn Mikko Korhonen and Swede Sebastian Soderberg were a shot off the lead, one clear of Jamie Donaldson, David Drysdale, Gavin Green, Guido Migliozzi, Erik Van Rooyen and Tommy Fleetwood. World number two Rory McIlroy found himself four shots behind the leaders, who were at seven under.