Rules Guy: My opponent putts with his mark to the side of his ball. Is that legal? What do you do if you notice your opponent making a stroke without picking up his ball mark? Original Source: https://golf.com/instruction/rules/opponent-putts-mark-side-ball-legal-rules-guy/ Previous article: "No Part" of Keegan Bradley Will Ever Get Over That Ryder Cup Loss Prev Next article: PGA Tour heads to Utah as South Korea hosts tournaments for LPGA and European Tour Next