England's Eddie Pepperell took a one-shot lead ahead of a group including Sergio Garcia and Miguel Angel Jimenez after round one of the Spanish Open.
Pepperell, 23, fired a four-under 68 to edge clear of world number seven Garcia, who finished third in the Players Championship on Sunday.
"I didn't have the greatest night and only slept for about four hours with the jet-lag," said Garcia, 34.
"I didn't feel extremely well with my swing but I managed to put it in play."
Also on three under were Scotland's Richie Ramsay, American Peter Uihlein, Portugal's Jose-Felipe Lima, German Thomas Pieters, Dutchman Robert-Jan Derksen and Spain's Rafa Cabrera-Bello.
England's Ross Fisher and Danny Willett and Scot Paul Lawrie were among those two under at PGA Catalunya, Girona.
Pepperell tied sixth at last year's BMW PGA Championship, which takes place again at Wentworth next week.