Singleton made his début in 2011's Super League XVI, coming off the bench in a 46–12 win over Salford.

He played in the 2015 Challenge Cup Final victory over Hull Kingston Rovers at Wembley Stadium.

[10][11][12] Singleton played in the 2020 Super League Grand Final which Wigan lost 8–4 against St Helens.

[14] In round 18 of the 2022 Super League season, Singleton was sent off in Wigan's 20–18 loss against St Helens at Magic Weekend for a dangerous high tackle.

[15] On 26 July 2023, Singleton signed for Salford as part of a swap deal with Tyler Dupree effective immediately.