[5] With his victory at The American Express in 2024, Dunlap became the first amateur in 33 years to win a PGA Tour tournament.

[7] The family briefly moved to Greenville, South Carolina before Dunlap's freshman year of high school, and he was then homeschooled when they returned to Alabama.

Brian Speakman, lead instructor at Greystone, recalled in 2021 that Dunlap was "extremely athletic" and also a "pretty high-level" baseball and football player.

[9][10] When he was 12, Dunlap shot a round of 59 at Highland Park Golf Course in Birmingham, Alabama, during a junior tournament which he won by 13 strokes.

He defeated Gordon Sargent in the first round of the match play en route to reaching the final, where he beat Neal Shipley, 4 and 3, to win the title.

Amateur victory, Dunlap represented the United States team at the 2023 Walker Cup and the 2023 Eisenhower Trophy.

The United States won both titles, and Dunlap was the runner-up in the individual stroke play at the 2023 Eisenhower Trophy.

[27] In January 2024, Dunlap received a sponsor exemption to play in The American Express on the PGA Tour.

He became the first amateur to win a PGA Tour event since Phil Mickelson won the Tucson Open in 1991.

[31] Due to his amateur status, Dunlap was ineligible for the winner's prize money of $1,512,000, which instead went to runner-up Christiaan Bezuidenhout.

[33][34] The week after his American Express victory, Dunlap announced that he was turning professional and had accepted PGA Tour membership.