It was big because at the start of his final round , any would - be challenger was going to have to shoot 65 if he simply played par golf .
The biggest number on this day for Spieth was zero bogeys .
It was big because at the start of Spieth 's final round , any would - be challenger was going to have to shoot 65 if he simply played par golf .
The biggest number on this day for Spieth was zero bogeys .