Wyndham Clark is atop the leaderboard after the first day of the Waste Management Phoenix Open. Clark carded a 10-under 61 on Thursday to lead by two strokes at the TPC Scottsale. Billy Horschel sits in second after shooting eight-under 63. Kentuckian J.B. Holmes is third at minus-seven, with Louisville area native Justin Thomas at three under and Nashville’s Brandt Snedeker at one over.