The opening round of the U.S. Open at Oakmont Country Club saw J.J. Spaun emerge as the leader after shooting an impressive 66, while top golfers including Rory McIlroy and Bryson DeChambeau faced challenges on the treacherous course. McIlroy started strong but faded late, ending the round with a score of 74. The leaderboard continues to shift as the tournament unfolds, with Spaun currently holding off competition from star players like Scottie Scheffler. The first round set the tone for a competitive U.S. Open, with golfers facing both pressure and the tough terrain of Oakmont.