On October 18, 2018, Stamkos recorded his 50th career game-winning goal in a 3–1 Lightning victory over the visiting Detroit Red Wings. In so doing, Stamkos became the third player in franchise history to record at least 50 game-winning goals, joining Vincent Lecavalier (60) and Martin St. Louis (64). On December 10, Stamkos scored a power play goal to record his 700th career NHL point. He became the third player in franchise history to reach 700 career points. Stamkos was also the first player from the 2008 NHL Entry Draft to record 700 career points. That same night, Stamkos also recorded his ninth career NHL hat-trick, in so doing also surpassing Martin St. Louis (8) for most hat-tricks in Lightning history. Stamkos' record breaking night helped the Lightning beat the visiting New York Rangers 6–3. On December 20, Stamkos played in his 700th career NHL game. He scored in the second period of that game, which moved him past Martin St. Louis for second-most goals in franchise history with 366. The goal came in a 5–4 shootout win against the Calgary Flames at the Scotiabank Saddledome. For December 2018, Stamkos set the Lightning record for most goals in a single calendar month with 14.