2007-08: Played for the Toronto Jr. Canadiens of the GTHL, where he won the 2008 OHL Cup with that club. Chosen by the Mississauga St. Michael's Majors eighth overall in the 2008 OHL Priority Selection.
2008-09: In his OHL rookie season, Smith-Pelly played in 57 games for the Majors. He scored 13 goals and added 12 assists for 25 points, adding 24 penalty minutes in those games. In 11 playoff games, Smith-Pelly scored 2 goals and added 3 assists for 5 points.
2009-10: In 60 games for the Majors, Smith-Pelly scored 29 goals and added 33 assists for 62 points. He was a +27 for the season, while also adding 35 penalty minutes. In the 2010 playoffs, Smith-Pelly scored eight goals and added 6 assists for 14 points. He was added to the Team Cherry roster for the 2010 CHL Top Prospects Game, and played in the 2009-10 OHL All-Star Game.
2010-11: Smith-Pelly was the second-leading scorer for a powerful Mississauga-St. Michael's team that had the OHL's best record and reached the playoff finals. He scored 36 goals with 30 assists in 67 games and was +49 with 50 PMs. Smith-Pelly led the Majors with 15 goals in 20 playoff games and also had 6 assists with a +11 plus/minus as the team rolled through the playoffs before falling to Owen Sound. The Majors hosted the Memorial Cup and Smith-Pelly was named to the All-Tournament team after scoring 3 goals with 3 assists and finishing +2 in five games. He signed a three-year, entry-level deal with the Ducks in December 2010.
2011-12: One of the big stories coming out of training camp for Anaheim, Smith-Pelly made the opening night roster as a 19-year old and skated in 49 games – missing time in mid-season after suffering a broken foot while skating for Canada in the 2012 U20 World Junior Championship. Smith-Pelly scored 7 goals with 6 assists and was minus-seven with 16 penalty minutes, averaging 12 minutes of ice time per game with the Ducks. He skated in four games with AHL Syracuse in a conditioning assignment prior to returning to Anaheim and was plus-one with 1 assist and 2 penalty minutes. He hurt his foot in his first game at the WJC and was scoreless with no penalty minutes.
Smith-Pelly posted point-per-game junior numbers but his contribution was not measurable on the stat sheet. He played a big game, both literally and figuratively. A somewhat stocky player, Smith-Pelly earned a reputation as a strong player going to the net, battling along the boards and taking the body all over the ice. He also elevated his game in key situations.
His physical and emotional maturity landed him a spot on the Ducks roster, where he should remain into the foreseeable future. He possesses good speed for his size and a knack for making the simple play. Smith-Pelly should become an excellent third-liner with tweener potential to move up and play top-six duty when called upon.