The talented and electric outside back Sean Wainui first represented New Zealand on the world stage after playing for the 2015 New Zealand Under 20 team, who won the World Rugby Junior World Championship in Italy. Returning from the Italy he joined the Māori All Blacks for the first time in 2015.

Since making his Investec Super Rugby debut in 2016 Wainui has represented New Zealand as a part of the Māori All Blacks.

Wainui has solidified himself as a regular in the game day 23 for the Gallagher Chiefs and broke the record for number of tries in a Super Rugby game when he scored 5 against the Waratahs in 2021. He was then selected again in the Māori All Blacks for 2021 and continued his fine form.

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