So much for all the good feelings about Muirfield. The historic venue in Scotland and host to a 16th Open Championship left plenty of the world's best grumbling during the first round on Thursday, even though more than a dozen players were under par. American Zach Johnson leads with a 5-under-par 66 and was followed by Spain's Rafael Cabrera-Bello, who shot 67, as well as 1998 Open champion Mark O'Meara, whose eagle at the 17th propelled the 56-year-old to within a shot of the lead. Jordan Spieth, a 19-year-old from Dallas who is coming off his first PGA Tour victory at last week's John Deere Classic, carded three birdies and a bogey in his Open Championship debut to finish at 2-under 69. Dustin Johnson and Brandt Snedeker were positioned nicely after 68s. Source: ESPN