Li made his senior debut for during the 2013 ITM Cup while aged just 18 years old and still a high school student. He managed 1 try in 4 games in his first season of provincial rugby and was subsequently promoted to the full squad for 2014. His second season saw him feature in all 10 of Harbour's championship matches and score 3 tries as the men from Auckland's North Shore finished in 5th place on the log, just missing out on the promotion play offs. He started every game in 2015 and helped himself to 4 tries as Harbour once again came agonisingly close to securing a play off berth, only to fall just short and end up in 5th spot. However, there was to be no such heartache in 2016 Mitre 10 Cup as Harbour finished in 3rd place in the regular season standings before seeing off the more fancied and in the playoffs to earn promotion to the 2017 Mitre 10 Cup Premiership. Li was again an ever-present, starting all 12 of Harbour's games during the year as well as bagging a career high 7 season tries including the opening try in the epic 40-37 semi-final victory away to Wellington.
Super Rugby
Li's swift rise from high school prodigy to the upper echelons of the rugby world continued apace in 2014 when Auckland-based Super Rugby franchise, the included him in their wider training group for the 2014 Super Rugby season. After Some impressive outings in pre-season, he was named on the bench for the opening game away to the and came on for his Super Rugby debut as a second-half substitute in a 21-29 loss for his side. He went on to score 3 tries in 8 matches in his first season of Super Rugby, at the age of 19. 2015 saw a little stagnation in his progress, featuring 7 times and failing to cross the try line once as the Blues endured a horror season, winning just 3 of 16 games to finish in 14th spot on the overall log. Prior to the start of the 2016 Super Rugby seasonTana Umaga replaced Sir John Kirwan as Blues head coach and this brought about an upturn in fortunes both for the franchise and for Li personally. The Blues finished in a more respectable 11th place, still well away from the play off spots, while Li started all 15 of their regular season games and scored 4 tries in what would prove to be his final season in Auckland. In June 2016, it was announced that Li had signed a 1-year deal with 2015 Super Rugby champions, the, that would see him move to Dunedin for 2017.
International
Li was a New Zealand Schools representative in 2012 and was also a member of the New Zealand Under-20 sides which competed in the 2014 IRB Junior World Championship and 2015 World Rugby Under 20 Championship. He scored 7 tries in 5 games in 2014 to help New Zealand to 3rd place in their home tournament and followed that up with 6 tries in 5 games in Italy the following year including a hat-trick against France which made him the highest try-scorer in tournament history. Li's tries also helped New Zealand to lift the World Under-20 Championship title for the first time since 2011 as they progressed through the tournament unbeaten and defeated England 21-16 in the final in Cremona.
