Sam Burns fell apart during the final round of the U.S. Open at Oakmont on Sunday, and a controversial ruling on No. 15 may have contributed to his collapse.

OAKMONT, Pa. — Sam Burns is a birdie machine at Oakmont, a label not many expected at this U.S. Open. By avoiding another sloppy finish, Burns posted a 5-under 65 on Friday and set the target for the late starters — and let Scottie Scheffler know the mountain he faced.

Sam Burns came into Friday knowing that he could play at Oakmont. He also knew what the course could do to him, having finished with three bogeys and one double bogey during Thursday’s opening round.