He then attended Oklahoma State University–Stillwater for whom he became the school record holder at long jump indoors and outdoors and competed at the NCAA Championships.

[1] Fincham-Dukes won silver at the 2015 European Athletics Junior Championships in the long jump, finishing behind Anatoliy Ryapolov.

[3] Returning to Europe to compete at the 2021 European Athletics Indoor Championships, he finished seventh in the final of the long jump at the Arena Toruń in Poland in March 2021.

After qualifying for the final of the long jump at the 2022 European Athletics Championships held in Munich in August 2022 Fincham-Dukes called out television broadcasters for not focusing enough on field events.

[11] In April 2024, he followed up his 8.02 indoor leap with a new personal best of 8.20m (1.2) in winning the Texas Invitational event posting the UKA Olympic qualifying standard and moving to 6th UK all time.