Lambie made his debut for the Sharks against The Highlanders at fullback on 18 March. His debut coincided with the end of the Sharks five game losing streak. He went on to start the next seven consecutive games (losing only one match against the champion Bulls which ended their five-match winning streak) for the Sharks and scoring two tries in the process. Lambie then played for the South African under-20 team in the 2010 IRB Junior World Championship in Argentina. He played fullback for all of the games and ended up as the tournaments second top scorer (behind Tyler Bleyendaal). South Africa ended third in the competition.