Duman made his AFL debut for Fremantle in round 5 of the 2018 AFL season against the Western Bulldogs at Optus Stadium.[2] After eight games he was rewarded with a one-year contract extension, which also elevated Taylin to the senior list for the 2019 season.[3] This was extended again in February 2019, when Fremantle signed him for a further two years.[4]