He was later selected for the Australian for the 2010 ICC Under-19 Cricket World Cup, opening the batting as Australia won the tournament.

Maddinson made his Big Bash League debut for Sydney Sixers in January 2011 and played for the side until the 2017/18 season.

He found a place in the side in the 2018–19 JLT One-Day Cup, playing in all eight matches and scoring two half-centuries.

He scored 162 runs on his Victoria Shield debut, but later broke his arm during a match, ruling him out for the finals.

At the same time he moved to play for Victorian side Melbourne Stars in the Big Bash.

[6] In 2024/25 Maddinson returned to play for New South Wales and also joined the Sydney Thunder in the BBL.