Ryo Hisatsune seized the early lead at the AT&T Pebble Beach Pro-Am after a bogey-free 62, while Rory McIlroy's title defense faltered with two costly double-bogeys. The Japanese star birdied three of his final holes to set the pace, leaving McIlroy six strokes back despite an eagle and six birdies during his four-under 68 at Spyglass Hill.

McIlroy's momentum collapsed with consecutive three-putt double-bogeys on par-threes, dropping him outside the top 25 on the leaderboard and ranking him outside the top 70 in putting statistics. World No. 1 Scottie Scheffler struggled to a 72, while Sam Burns and Keegan Bradley sit tied in second after matching bogey-free 63s.

Justin Rose sits one shot behind fellow Brit Harry Hall after a 69, though Ludvig Aberg continues early season struggles with a seven-bogey 75. The leaderboard suggests 7-under may be needed for top-10 contention as the tournament progresses, with Hisatsune establishing himself as the player to beat through the opening round.