Niua signed a professional contract with USA Rugby in January 2012 to play full-time for the U.S. national sevens team. Niua was a regular on the U.S. national team in the 2011–12 IRB Sevens World Series, finishing the season as one of the leading scorers for the team. Niua also played for the U.S. during the 2012–13 IRB Sevens World Series, leading the team with 30 points at the 2012 South Africa Sevens. Niua also played for the U.S. during the 2016 Summer Olympics.