Scottie is 3 up going into the final day. Some of the players, including Scottie and Lowery, have complained about mud.
The course looks beautiful but it had rained there quite a bit before the tournament started. Just below the surface it is wet and when the all lands on the fairway it picks up mud. It's much harder to control the shot with mud on the ball.
Some of the players have ask the PGA to allow marking and picking up the ball to wipe the mud off and then replace it at the exact spot. The PGA has refused to make that adjustment to the rules, which I think is wrong on the part of the PGA.