Anirban Lahiri of India shot 8-under 63 Thursday for a two-stroke lead at the European Masters, while 13-year-old Ye Wo-cheng of China finished with a 78.
The 178th-ranked Lahiri had two eagles and five birdies in the Swiss Alps sunshine and led Miguel Angel Jimenez of Spain and Englishmen Paul Casey and Tommy Fleetwood.
Thomas Bjorn, the 2011 champion from Denmark, shot 66 to stand alone at 5 under.
Jose Maria Olazabal of Spain, the winning Europe Ryder Cup captain last year, was among six players at 4 under.
The teenager Ye had a double bogey on three of his first four holes after starting his round at the 10th.