(AP Photo/Gerald Herbert)

PALM HARBOR, Fla. (AP) The final hour changed the dynamics of the Valspar Championship, just not the lead.

That still belongs to defending champion Paul Casey, and he saw only the upside of having his three-shot margin shrink to one, and going from a final round pairing with a player who is 0 for 195 on the PGA Tour to playing alongside the No. 1 player in the world.

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.

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