Jordan Spieth hits his tee shot on the ninth hole during the second round of the AT&T Pebble Beach Pro-Am golf tournament at Pebble Beach Golf Links. Kyle Terada-USA TODAY Sports

A mental mistake on Friday marred Jordan Spieth’s run at the Genesis Invitational held at Riviera Country Club in Los Angeles.

During his second round, Spieth made a bogey on the Palisades course’s par-3 4th hole. Spieth missed the green wide left and ended up whiffing on a 5-foot putt for par. Instead of signing for four strokes on his scorecard, the three-time major winner accidentally signed for three.

The 30-year-old was disqualified for the infraction. Spieth held himself accountable for the mistake in a post on X.

“Today, I signed for an incorrect scorecard and stepped out of the scoring area after thinking I went through all procedures to make sure it was correct. Rules are rules, and I take full responsibility. I love this tournament and golf course as much as any on [the PGA Tour] so it hurts to not have a run at the weekend. Really appreciated the support in L.A.,” Spieth wrote.

Spieth entered Friday only two strokes behind Patrick Cantlay for the $20 million event lead. The world's No. 12 golfer started his second round strong with three birdies over his first seven holes. However, things took a turn on the back nine. Spieth bogeyed thrice before recovering with a birdie on the 17th hole. Spieth ended his run by making a double bogey on the 18th.

Spieth had reportedly been feeling unwell earlier during the day.

The disqualification was Spieth’s first over his 263 tournaments played on the PGA Tour.

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