Kersten was considered to make his AFL debut in the 2013 preliminary final,[1] but due to a knee injury[2] had to wait until round 14 of the 2014 AFL season to be selected. He kicked three goals in his debut game and was a standout despite Geelong losing to Gold Coast by 40 points.[3] Kersten celebrated his first win the following week against Essendon when he kicked two goals as Geelong. After making his debut Kersten struggled at times to maintain his spot in the side but developed into a second forward target alongside Tom Hawkins, as well as an effective defensive.[2]
At the conclusion of the 2016 season, after not playing in Geelong's two final series games, Kersten was traded to Fremantle in return for selection 63 in the 2016 AFL draft.
In his first season at Fremantle, Kersten kicked 24 goals from 20 games, coming second in Fremantle's goal kicking leaderboard. His most noted performance came in round 5 against North Melbourne at Domain Stadium. With only 40 seconds left in the final quarter, Kersten brilliantly snapped a late running goal from the deep right pocket, giving Fremantle a 5-point lead, leading them to victory.[4]
In 2018, he began playing as a key defender after some poor performances as a forward, and made his debut in that role in round 13 of the 2018 season against Carlton.[5]
Statistics
Statistics are correct to the end of the 2016 season[6]