2009-10: Zac Leslie appeared in one junior A game as a 16-year-old and played for the Ottawa Junior 67's midget AAA and minor midget teams. He had no points nor penalty minutes in his one game with the CJHL's Gloucester Rangers. He played eight midget AAA games for the Junior 67's, including three playoff games, and scored 1 goal with 3 assists and 4 penalty minutes. In 29 games for Ottawa's midget minor team he scored 10 goals with 24 assists and had 36 penalty minutes. Leslie scored 2 goals with 6 assists and 12 penalty minutes in 11 playoff games as the Junior 67's captured the central region silver medal. Leslie was selected by Guelph in the fourth round (63rd overall) of the 2010 OHL Priority Draft.
2010-11: Leslie skated for the CCHL's Gloucester Rangers in Canadian junior A hockey – keeping his college hockey options open. He scored 13 goals with 22 assists and had 26 penalty minutes in 56 games. The Rangers finished fourth and reached the second round in the playoffs. Leslie scored 1 goal with 3 assists and had 4 penalty minutes in nine playoff games.
2011-12: Leslie signed with the OHL's Guelph Storm, foregoing NCAA college hockey. He played 65 games for the Storm in his first season and scored 2 goals with 15 assists; finishing -3 with 54 penalty minutes. Guelph made the playoffs after finishing fourth in the Midwest Division. Leslie played in five of six games in the series with Plymouth and was -2 with no points and 4 penalty minutes. Leslie was ranked 204th amongst North American skaters in Central Scouting's final rankings but was not selected in the 2012 NHL Draft.
2012-13: Leslie was the second-leading scorer amongst Guelph defensemen trailing only Andrei Pedan (44 points) for the Storm. He scored 12 goals with 28 assists and was +16 with 58 penalty minutes and skated in all 68 games. Guelph finished fourth in the Midwest Division and reached the playoffs. Leslie had 1 assist and was -1 with 4 penalty minutes in the five game series with third-place Kitchener. Ranked 146th amongst North American skaters in Central Scouting's final rankings, Leslie was selected by Los Angeles in the sixth round (178th overall) of the 2013 NHL Draft.
Leslie has an average game in almost every regard. However he has shown a real knack for improving at a decent rate and having a good solid work ethic. While not doing anything truly outstanding Leslie has a mindset that could see him blossom into a decent all-around defenseman. He could also stand to add a few pounds and get stronger
Leslie seems to be a bit of a long term project and a boom-or-bust pick. Scouts love his attitude and work ethic and it has shown some success recently. He will return to Guelph in the OHL in 2013-14 where he will really need to continue his improvement to make a mark on the King system.