During Thursday's opening round of the U.S. Open at the Los Angeles Country Club, Phil Mickelson, who joined the Saudi-backed LIV Golf last year, found himself the target of heckling. A spectator, positioned on the grandstand railing at the 18th hole, reportedly taunted Mickelson for over half a minute, referencing his LIV Golf involvement and an alleged Victoria's Secret sponsorship.

Phil Mickelson chips onto the green during the first round of the U.S. Open at Los Angeles Country Club on Thursday, June 15, 2023. (AP Photo/Lindsey Wasson)

Despite the distraction, Mickelson maintained composure, finishing his round with a 69, tying for 25th place. This impressive performance came on a day where Xander Schauffele and Rickie Fowler made history, scoring a record-breaking 62, the lowest ever for a U.S. Open round.

Phil Mickelson observes his tee shot on the 18th hole during the U.S. Open at Los Angeles Country Club on Thursday, June 15, 2023. (AP Photo/Matt York)

Reflecting on his performance, Mickelson acknowledged a couple of errant swings that cost him a few strokes but expressed overall satisfaction with his play. He remained focused on the tournament, choosing to defer discussion regarding the recent PGA Tour and LIV Golf merger.

Phil Mickelson gestures during the first round of the U.S. Open on Thursday, June 15, 2023. (AP Photo/Matt York)

Mickelson stated his desire to avoid distractions and maintain his focus on the tournament, emphasizing his strong performance and aiming for contention.