The Commodores shot a 12-under final round to erase a three-shot deficit and win the tournament by five shots over TCU.
The 12-under 276 was the best round of the tournament by four shots (LSU shot a round two 280).
TCU finished in solo second place at 8-under, and Baylor finished in solo third place at 4-under. Virginia finished in solo fourth place at 1-under, and Oklahoma finished in solo fifth place at 1-over.
Sullivan, Gustav Frimodt of TCU, and Johnny Keefer of Baylor all shot 6-under par to go to the three-man playoff.
Sullivan recorded a birdie on the second playoff hole to win the tournament.
Connor Gaunt of LSU finished in solo fourth place at 5-under.An exciting end to an incredible week at the inaugural #ValeroTexasCollegiate!🏆
— Valero Texas Open (@valerotxopen) September 12, 2023
🎥Relive all the action from today’s final round! pic.twitter.com/k541CAAO91
Matthew Riedel of Vanderbilt, Luke Kluver of Oklahoma, and Carter Loflin of Georgia all finished T5 at 4-under.
The number one ranked amateur in the world, Gordon Sargent, a Vanderbilt junior, finished in T19 at 1-over.
Sargent is fresh off going 3-0 in the Walker Cup and leading the United States team to the win over Great Britain and Ireland.
