2008-09: Stuart Percy played for the Toronto Marlboros in the GTHL. He was chosen in the first round, 15th overall, of the 2009 OHL Priority Selection by the Mississauga St. Michael’s Majors.
2009-10: In his OHL rookie season, Percy played in 52 games for the Majors. He scored 3 goals and added 15 assists for 18 points. Percy registered 1 assist in 16 playoff games. Percy played for Team Ontario at the 2010 World U-17 Hockey Challenge, picking up 3 assists in 6 games for the silver medal squad.
2010-11: In 64 games for the Majors, Percy scored 4 goals and added 29 assists for 33 points to go along with 50 penalty minutes. In 20 playoff games, he scored 2 goals and added 10 assists for 12 points. Percy registered 4 assists in 5 Memorial Cup Tournament games for the Majors. Percy played for Team Orr at the 2011 CHL Home Hardware Top Prospects Game.
2011-12: Percy made his pro debut — appearing in one regular season game and three playoff contests for the AHL’s Toronto Marlies — following an injury-filled third junior season that included two concussions and an October knee injury. He had an assist in his AHL debut on April 15th against Adirondack and played all three games in the first round series with Rochester; finishing plus-one with no points nor penalties. Limited to 34 games during the regular season for Mississauga St. Michael’s, he scored 5 goals with 25 assists and was plus-18 with 41 penalty minutes. The Majors reached the playoffs after finishing fifth in the Central Division. Percy was minus-two in the six-game series with Barrie; scoring 1 goal with 1 assist and getting 4 penalty minutes.
2012-13: Percy returned to Mississauga for his fourth OHL season — skating for the re-christened Steelheads — and finished the season in the AHL playing for the Toronto Marlies. In four AHL games he scored 1 goal with 2 assists and was -1 with 2 penalty minutes. Toronto finished first in the North Division and reached the second round in the AHL playoffs. Percy did not play in any playoff games. In 68 games with Mississauga he scored 13 goals with 32 assists and was -8 with 44 penalty minutes. The Steelheads reached the playoffs despite finishing last in the Central Division; falling to Belleville in six games. Percy had 2 assists and was -6 with 4 penalty minutes in six playoff games.
2013-14: Percy skated for the AHL’s Toronto Marlies in his second first season. He skated in 71 regular season games, scoring 4 goals with 21 assists and finishing +4 with 30 penalty minutes. The Marlies finished first in the North Division and reached the Western Conference finals. Percy had 2 assists and was -7 with 4 penalty minutes in 14 playoff games.
2014-15: Percy made the Maple Leafs out of training camp, averaging over 20 minutes of ice time in his first five games before eventually being returned to the Marlies in November. He played in one other NHL game in January, finishing -4 with 3 assists and 2 penalty minutes while averaging 18 minutes of ice time in nine NHL games. Percy battled to stay healthy, playing in 43 regular season games for the Marlies. He scored 1 goal with 10 assists and was +1 with 14 penalty minutes. Toronto finished second in the North Division, falling to Grand Rapids in a first-round playoff series. Percy was -1 with 2 assists and 2 penalty minutes in four playoff games.
2015-16: Percy played three February games with the Maple Leafs, spending most of his third pro season with the AHL’s Marlies. He was -2 with no points nor penalties, averaging 13 minutes of ice time with the Leafs. Percy scored 4 goals with 20 assists and was +3 with 47 penalty minutes in 58 regular season games for the Marlies. Toronto finished first in the North Division, advancing to the Eastern Conference finals against Hershey. Percy had 2 assists and was -7 with 4 penalty minutes in 14 playoff games.
Percy possesses all-round capability, and is very calm under pressure situations. He moves the puck efficiently out of the defensive zone and is starting to become a threat offensively – although he is unlikely to develop into a premiere offensive defender. He is still developing his power and skating skills.
Percy appeared in three NHL games with Toronto in 2015-16, spending most of the year in the AHL. A first-round pick by the Maple Leafs by the previous regime in 2011, he has been slowed by injuries and not yet reached the level envisioned when he was a scoring threat and a physical defender in junior hockey. Percy would be an unrestricted free agent if not tendered a contract offer by the Maple Leafs. He no longer projects as a top pairing defender but could have some value in a lesser role for a team in need of defense help.