Rule change costs McIlroy two-shot penalty at Pebble Beach

PEBBLE BEACH, CALIFORNIA - FEBRUARY 01: Rory McIlroy talks to rules official Stephen Cox during the first round of the AT&T Pebble Beach Pro-Am at Spyglass Hill Golf Course on February 01, 2024 in Pebble Beach, California. (Photo by Christian Petersen/Getty Images)

Belgium's Thomas Detry took a one-shot lead after the first round of the AT&T Pebble Beach Pro-AM as Rory McIlroy suffered a dramatic late-round collapse.

McIlroy, playing his first PGA Tour round of the year after a win and a second place in Dubai, was leading after 14 holes as three successive birdies took him to six-under-par.