Lafleur was drafted first overall by the Canadiens in the 1971 NHL Amateur Draft. He made an immediate impact on the league, scoring 36 goals and 50 assists in his rookie season. He went on to win the Calder Memorial Trophy as the NHL's Rookie of the Year.

Guy was one of the most dominant scorers in NHL history. He led the league in points three times (1976, 1977, and 1978) and goals twice (1975 and 1978). He also became the first player in NHL history to score 50 goals in six consecutive seasons.

Lafleur was a key member of the Canadiens' dynasty of the 1970s. He helped the team win five Stanley Cups in seven years (1973, 1976, 1977, 1978, and 1979). He was also named the Hart Memorial Trophy winner as the NHL's MVP twice (1977 and 1978).

He retired from the NHL in 1985, but returned for one season with the Nordiques in 1991-92. He finished his career with 560 goals, 793 assists, and 1,353 points in 1,126 games. He is the all-time leading scorer in Canadiens history.

Lafleur was inducted into the Hockey Hall of Fame in 1988. He is considered one of the greatest players in NHL history, and his legacy continues to inspire hockey fans around the world.