[2] In 2009 and 2010, he played for the Sturt Sabres, winning team MVP honours in 2009 and a Central ABL championship in 2010.

[3] In Year 12 at Sacred Heart College, Maynard averaged 26 points per game en route to being named MVP of the 2010 Marist National Championships.

[4][5] As a sophomore in 2011–12, Maynard vastly improved, but his development was disrupted due to an injury which forced him to miss 11 games, including the final six of the regular season.

[8] After injuring his left thumb on 3 January 2015 against the Townsville Crocodiles, Maynard was ruled out for an extended period of time.

[9] Upon his return to health, however, prior to the Taipans' semi-final match-up against the Perth Wildcats, Maynard lost his spot in the line-up to 11th man Nathan Sobey.

[15] In 2015–16, Maynard proved himself capable of running the offence, setting up his teammates, getting to the rim himself, hitting the outside shot, and playing strong defence.

[23][24] On 5 August 2017, Maynard made his AFL debut in Melbourne's 97–62 loss to the Greater Western Sydney Giants in Canberra.

[25] He had 18 disposals and kicked a goal against the Giants, with coach Simon Goodwin saying Maynard did everything that could've been expected from him in his first AFL game.

His grandfather, Graham Campbell, played 151 games for Fitzroy and won the club's 1957 best and fairest award.