2010-11: Robby Fabbri skated for the Mississauga Rebels bantam AAA team that captured the Ontario Hockey Federation championship.
2011-12: Fabbri appeared in two junior A games with the OJHL’s Toronto Junior Canadiens and was team captain of the Mississauga Rebels midget minor AAA team. He had 3 assists in a regular season game and was scoreless in an OJHL playoff contest with the Junior Canadiens. Fabbri scored 57 goals with 48 assists and had 75 penalty minutes in 60 games for the Rebels. Mississauga captured the championship of the 2012 OHL Cup and Fabbri scored 4 goals with 4 assists and 8 penalty minutes in seven games at the tournament. He was selected by Guelph in the first round (sixth overall) of the 2012 OHL Priority Draft.
2012-13: Fabbri skated for the OHL’s Guelph Storm and represented Canada Ontario in the 2013 U17 World Hockey Challenge. He scored 10 goals with 23 assists and was plus-13 with 38 penalty minutes in 59 regular season games. The Storm lost to Kitchener in a first round series after finishing fourth in the Midwest Division. Fabbri had 1 assist and was minus-1 with 4 penalty minutes in five playoff games. He scored 3 goals with 1 assist and had 27 penalty minutes in five games for Canada Ontario at the WHC.
2013-14: Fabbri skated for Canada’s gold medal U18 team at the Ivan Hlinka Memorial Tournament before returning to Guelph and skating for the Memorial Cup-bound Storm in his second OHL season. He was the second-leading scorer for Guelph during the regular season despite missing 10 games. Fabbri scored 45 goals with 42 assists, trailing only Scott Kosmachuk (WPG), and was plus-45 with 55 penalty minutes in 58 regular season games. The Storm finished first in the Midwest Division, leading the OHL with 108 points, and defeated North Bay in the OHL finals. Fabbri scored 13 goals with 15 assists in 16 playoff games and was plus-16 with 12 penalty minutes. Guelph won three straight games at the Memorial Cup before falling to Edmonton in the championship game. Fabbri scored 2 goals with 4 assists and was plus-2 with 4 penalty minutes in four Memorial Cup games. He had 1 assist and was minus-2 with 4 penalty minutes in five games at the Ivan Hlinka tournament. Fabbri was selected to play for Team Cherry in the 2014 CHL/NHL Top Prospects Game. He was ranked 21st amongst North American skaters in the Central Scouting final rankings and was selected by St. Louis in the first round (21st overall) in the 2014 NHL Draft.
Fabbri was one of the top forwards for the OHL's Guelph Storm during the team's run to the 2014 Memorial Cup. While his lack of size is an issue, his competitiveness is through the roof, and his leadership skills, along with his offensive abilities are first rate.
Fabbri attended his first training camp with the Blues — signing a three-year entry-level contract with St. Louis in September 2014 — before being returned to Guelph for the 2014-15 season. Now in his third year of junior hockey he continues to pile up points. He attended Hockey Canada's summer evaluation camp and played for Team OHL in the Subway Series. He has an outside chance of playing for Canada in the 2015 World Juniors. Long-term Fabbri projects as an effective two-way center at the NHL level should he continue to develop his all around game and fill out physically.