After starting 2016 with no status on any tour, Poston
Monday qualified for the
United Leasing Championship on the
Web.com Tour and finished T23. His finish earned him entry into the
Rex Hospital Open, where a tie for third earned him Special Temporary Member status for the season. Five more top 15s, including two second-place finishes, resulted in Poston finishing 10th on the regular-season money list and earning a 2017
PGA Tour card. On August 4, 2019, Poston earned his first professional victory by winning the
Wyndham Championship, after shooting an 8-under 62 in the final round and going bogey-free in the tournament. He became the first player since 1974 to win a PGA Tour event while going bogey-free. On July 3, 2022, Poston won the
John Deere Classic by three strokes over
Christiaan Bezuidenhout and
Emiliano Grillo. Poston led after each round of the tournament, becoming the first player since 1992 to win the tournament wire-to-wire. This win also secured him a spot in the
2022 Open Championship. On October 21, 2024, Poston won the
Shriners Children's Open, which was his third PGA Tour title. ==Amateur wins==