For a while on Saturday, it looked as if Phil Mickelson was going to run away with the PGA Championship.
"Lefty" flew ahead to a massive 5-shot lead early in the third round at the Ocean Course behind five birdies in his first 10 holes of the day.
But a blunder on the back nine opened the door up for the rest of the field, and Brooks Koepka took advantage.
Koepka, who started the day just one back, will now enter the final round the same way in a group alongside Mickelson at Kiawah Island in South Carolina.