AUGUSTA — Sergio Garcia might have written himself off too quickly at the Masters. When last seen walking off the course at Augusta National, the impetuous Spaniard was moping about his bad luck at this tournament and said last year it was increasingly evident he would never be fitted for a green jacket. Garcia matched his best score at the Masters on Thursday, a 6-under 66 with no bogeys on his card, to share the lead with Marc Leishman of Australia.