He played his junior rugby league with the Thirroul Butchers and Mt Wellington Warriors and has represented the Cook Islands.

[2] Marsters made his first grade debut in round 15 of the 2020 NRL season for South Sydney against Manly-Warringah, scoring a try in a 56–16 victory at ANZ Stadium.

[3][4] In round 9 of the 2021 NRL season, he made his first start of the year for South Sydney in a 50–0 loss against Melbourne at Stadium Australia.

[6] In the opening round of the 2021 Rugby League World Cup, Marsters scored a try in the Cook Islands victory over Wales but was taken from the field late in the second half with a knee injury.

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