2010-11: Spencer Martin played for the Toronto Junior Canadians in the Greater Toronto midget major league and competed for Team Ontario in the 2011Canada Winter Games. In 50 games he posted a 2.27 goals against with five shutouts. In four games at the 2011 OHL Cup he was 5-1 with a 3.24 goals against. He played four games for Team Ontario; posting a 3.10 goals against and .868 save percentage. Martin was selected by the Mississauga St. Michael's Majors in the first round (18th overall) of the 2011 OHL Priority Draft.
2011-12: Martin appeared in 15 games for the Majors in his first OHL season as veterans J.P. Anderson and Brandon Maxwell split the bulk of the goaltending. He was 2-7-1 with a 3.98 goals against and .885 save percentage. Mississauga St. Michael's reached the playoffs despite finishing last in the Central Division but Martin did not see any action in the first round series with Barrie. Martin represented Canada Ontario at the 2012 U17 World Hockey Challenge and was with Canada's bronze medal-winning U18 team at the 2012 World Junior Championship but did not see any action. In five games at the WHC he finished with a 1.95 goals against and .931 save percentage.
2012-13: Martin handled the bulk of the goaltending for the re-named Mississauga Steelheads in his first full OHL season; appearing in 46 games. He was 17-21-4 with a 3.02 goals against and .906 save percentage. The Steelheads reached the OHL playoffs; finishing fifth in the Central Division. Martin started the first playoff game against Belleville, an 8-1 loss and made one relief appearance, replacing Tyson Teichmann, who handled the bulk of the goaltending in the playoffs. Martin skated with Canada's gold medal team at the 2013 U18 World Junior Championship. He made two starts and was 2-0, allowing two goals and finishing with a .941 save percentage. Martin was ranked fifth amongst North American goaltenders in Central Scouting's final rankings prior to the 2013 NHL Draft.
There are not many 17 year olds who start in the Ontario Hockey League. Goaltending in the OHL is an ‘older-man’s’ game, and it takes someone with poise and an even-keeled temper -- and that’s Martin’s game to a tee.
Martin’s game is predicated on speed, agility, and the ability to react. He’s a tall goaltender who embraces the butterfly style -- almost too much. He’s quick to go down and uses his speed and agility to scramble back into the play.
On a less-than-elite Steelheads’ squad, Martin saw plenty of rubber and handled it well -- despite middling success at times. If he can continue to work on his technical game, he has the physical and mental attributes needed for success.