After Sargent led the first two rounds, Dunlap used an 8-under 63 to vault into first place to win the medalist honors in the SEC Match Play at the Country Club of Birmingham in Birmingham, Ala., by one shot over Sargent.
Dunlap finishes the stroke play at 15-under with rounds of 70-65-63, while Sargent finishes at 14-under with rounds of 64-65-70.
Dunlap birdied No. 18 to win dramatically.
The victory is Dunlap's second collegiate win of his career and first of the season. He set personal-best marks this week for an 18-hole score with his round of 8-under 63 and 54-hole total score vs. par at 15-under.
Dunlap becomes the fifth Alabama golfer to card a round sub-200 score for a tournament and the first to do so since Robby Shelton achieved the feat in the 2015 Jerry Pate National Intercollegiate.
Dunlap's total of 198 is tied for the second-lowest 54-hole tournament total in Alabama school history, second only to Bobby Wyatt's school record of 192 in the 2014 SEC Championship.
Brendan Valdes of Auburn finished in solo third place at 12-under, and JM Butler and Phichaksn Maichon of Texas A&M finished T4 at 11-under.
Vanderbilt finished in second place at 28-under to make the championship match against Auburn, and Arkansas finished in third place at 25-under.
Ole Miss finished in fourth place at 24-under, and Tennessee finished in fifth place at 23 under.
