He is a left-handed top-order batsman who also bowls right-arm medium pace.

Haines made his List A debut on 23 July 2021, for Sussex in the 2021 Royal London One-Day Cup.

[3][4] In April 2022, in the 2022 County Championship, Haines scored his maiden double century in first-class cricket, with 243 runs against Derbyshire.

[5] Along with Cheteshwar Pujara, Haines became the first batters to score double centuries in the same innings of a first-class match while following-on.

This biographical article related to an English cricket person born in the 1990s is a stub.