It was the first round of the US Women’s Open in Natthakritta Vongtaveelap’s career, but it ended after just five holes after her caddy’s gross mistake led to her disqualification from the tournament at Pebble Beach.

The 20-year-old’s caddy was seen using a rangefinder, which is prohibited at the US Open.

USGA rules officer Kathryn Belanger said her caddy used the rangefinder «at least a couple of times», leading to a disqualification. If it was once, the penalty would have been two shots from Vongtaveelap’s total score for the round.

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Natthakritta Vongtaveelap tees on the first hole during the second round of the LPGA Mizuho Americas Open at Liberty National Golf Club on June 2, 2023 in Jersey City, New Jersey. (Rich Graessle/Icon Sportswire via Getty Images)

Rangefinders are not allowed on the PGA Tour during tournament rounds, but most LPGA Tour events have allowed them since 2021. However, the US Open remains a no-go tournament for golfers.

At the time of the disqualification, Vongtaveelap was even.

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The Vongtaveelap caddy isn’t the only one to learn about the rangefinder rule, as the Korn Ferry Tour, the level just before the PGA Tour, saw Zach Williams get disqualified after using his rangefinder on multiple occasions.

Natthakritta Vongataveelap walks

Natthakritta Vongtaveelap watches from the 13th green during the second round of the Mizuho Americas Open at Liberty National Golf Club on June 2, 2023 in Jersey City, New Jersey. (Adam Hunger/Getty Images)

Williams had qualified for the Memorial Health Championship, and that qualifier allowed rangefinders. However, the tournament itself did not, as the Korn Ferry Tour bans them.

Vongtaveelap got off to a strong start to her LPGA Tour career, as she was runner-up at the Honda LPGA Thailand tournament and finished tied for sixth at the LOTTE Championship.

Natthakritta Vongataveelap

Natthakritta Vongtaveelap, left, talks to her caddy before the first hole during the final round of the Honda LPGA Thailand at Siam Country Club on February 26, 2023 in Chon Buri, Thailand. (Thananuwat Srirasant/Getty Images)

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However, she has been back down to earth since the start of the season, as the Thai golfer made just one cut in her last five starts.