He played fly-half for the United States national rugby sevens team from 2011 to 2022, and holds the U.S. record for most tournament appearances with over 65 caps.

He then played with San Francisco Golden Gate, where he helped the team win the 2011 Rugby Super League national championship.

[3] Niua played in the August 2011 national all-star championships, where his impressive scoring ability and fitness led the Pacific Coast team.

[4] Niua debuted for the United States national sevens team at the 2011 Pan American Games, where, despite his lack of international tournament experience, he was the starting flyhalf.

[5] Niua was the top scorer for the U.S. in that tournament with 41 points, including a 78% success rate in kicking his conversions, helping the U.S. achieve a bronze medal.