Originally from Benalla, Mellington played junior football for the Murray Bushrangers in the TAC Cup.
In 2010, Mellington led the Bushrangers' goalkicking, with 41 for the season, and finished fourth in the TAC Cup best and fairest.
[2] A small forward, Mellington played his first games for Fremantle in a NAB Cup pre-season double header against Hawthorn and West Coast on 14 February 2011.
[4] Mellington was delisted by Fremantle following the 2013 AFL season after only playing six games in his three-year stint at the club.
In 2021 Mellington kicked 27 goals in a game for Violet Town against Tallygaroopna while playing in the Kyabram District Football League.