Behind a 7-under 63 by junior Aaron Du, the California Golden Bears grabbed the first-round lead at the Western Intercollegiate being played at Pasatiempo Golf Club in Santa Cruz, Calif.

The Bears carded an opening round 16-under 334 in the six-count-five format and will take a one-stroke lead into Tuesday's second round over Oregon (-15) while Stanford (-11) is five off the pace.

Du put on quite the show for the national audience watching on the Golf Channel, registering six birdies and an eagle on the par-70 Alister Mackenzie layout. For a tournament that boasts alumni that have tallied 550 PGA Tour wins, including 50 majors, Du's 7-under 63 tied the tournament scoring record, shared by Jason Allred of Pepperdine (2000) and John Streibich of Xavier (2007).

Cal also benefitted from under-par rounds by Sampson Zheng (66), Jeewon Park (67), Daniel Heo (67) and a 1-over 71 by Nathan Wang.

Oregon nearly matched Cal shot-for-shot, carding a 15-under 335. Junior Gregory Solhaug is just one back of Du after carding an opening round 64 while Owen Avrit is two back after signing for a 65. Greyson Leach (68), Nate Stember (69) and Aiden Krafft (69) were also in red numbers for the Ducks.

Stanford's Michael Thorbjornsen shot a bogey-free 64 and along with Solhaug, is one back of Du heading into Tuesday's second round.

The final two rounds of the Western Intercollegiate will be carried live on Golf Channel. Tuesday's coverage begins at 4:00 p.m. PT with Wednesday's final round scheduled for 1:00 p.m. PT.

ENTRIES OPEN: Entries are now open for 2024 U.S. Mid-Amateur Championship

15-year-old Miles Russell climbing the leaderboard on Sunday

ENTRIES OPEN: 2025 U.S. Amateur Four-Ball

Miles Russell shatters records in Korn Ferry Tour and professional golf debut

Meet the five amateurs teeing it up at The 2024 Masters