J.J. Spaun leads the 125th U.S. Open after a bogey-free 66 at Oakmont, tying the lowest first-round score. Other notable performances include Thriston Lawrence's six birdies, Brooks Koepka's return to form with a 68, and Si Woo Kim's exceptional approach shots. However, the course proved challenging, with many top players struggling. World number one Scottie Scheffler shot a 73, while Rory McIlroy had a disappointing 74. Patrick Reed made a rare albatross but finished with a 73. The challenging course saw higher scores than expected, making a comeback possible for those behind the leader.

Prepared by Emily Rhodes and reviewed by editorial team.