The final hour changed the dynamics of the Valspar Championship, just not the lead. On a Saturday at Innisbrook that began with all 70 players who made the cut still very much in the mix, Casey surged to a three-shot lead until a bogey on the 18th hole for a 3-under 68 that left him one shot ahead of Dustin Johnson. At stake for Casey is a chance to become the first back-to-back winner of the Valspar Championship since this PGA Tour event began in 2000.