Duncan played on the
PGA Tour Latinoamérica in 2014 where his best finish was T-6 at the
Lexus Panama Classic. In December 2014, Duncan finished in the top 45 at the Web.com Tour Qualifying Tournament earning his Web.com Tour card for 2015. He played on the
Web.com Tour from 2015 to 2017. His best finish on the Web.com Tour was T-2 at the 2015
Brasil Champions and T-2 at the 2017
BMW Charity Pro-Am. In November 2019, Duncan won the
RSM Classic in a playoff over
Webb Simpson. It was Duncan's first win in a multiple-day event since the 2011 Indiana Amateur. He did not win while playing college golf at Purdue and did not win at any level in professional golf. His win included his lowest round on tour, a second round 61. ==Personal==