He was educated at Tonbridge School, before going up to Jesus College, Oxford to read classics, graduating in 2020 with a Double First.
[3] After leaving Oxford in 2020, Pettman was about to start a job in data analytics when he was offered a one-year professional cricket contract by Nottinghamshire coach Peter Moores.
[6] Making his County Championship debut against Middlesex at Queen's Park, Chesterfield, he took 3 wickets for 40 runs to record the best bowling figures in Derbyshire's first innings.
[7] Later in the month he also played a single Championship game for Kent as a short-term loan signing to cover for injuries.
[8][9] On 20 August 2022, Pettman made his List A debut for Nottinghamshire in a One-Day Cup match against Leicestershire, taking 1/45 off nine overs and scoring five not out.