It is, in fact, the back half of the 9th green, upon which the USGA, as it has done in past U.S. Opens here, is permitting players to practice this week.

Out of the famous green clubhouse and rolling down the hill, the par 70 does not extend a warm welcome to those attempting to conquer it. No. 1 serves as the most difficult hole at the 2016 U.S ...