Duursma made his AFL debut in Port Adelaide's win over Melbourne in the opening round of the 2019 AFL season.[2] He scored a goal on debut. In Round 6, Duursma earned the Rising Star nomination, following Port's 16 point win over North Melbourne.[3] He quickly became well known for his bow and arrow goal celebration.[4]
Following the conclusion of the 2020 AFL season, which concluded with a preliminary final loss to Richmond, Duursma inherited the number seven guernsey from retired veteran Brad Ebert.[5]
^The 2020 season was played with 17 home-and-away matches per team (down from 22) and 16-minute quarters with time on (down from 20-minute quarters with time on) due to the impact of the COVID-19 pandemic.