2011-12: C.J. Yakimowicz played junior hockey with the Wilkes-Barre Scranton Knights in the Metropolitan Junior Hockey League as a 15-year-old. In 37 games he scored 11 goals with 13 assists and 26 penalty minutes.
2012-13:Yakimowicz provided scoring and physical play in his second Met League season with the Knights. In 31 games he scored 13 goals with 22 assists and had 80 penalty minutes. Yakimowicz was selected to participate in the 2012 Liberty Bell Games for the top prospects in the USA Hockey Atlantic District in June.
2013-14: Yakimowicz joined the OHL’s London Knights as a free agent at the end of December after skating for the Wilkes-Barre/Scranton Knights U18 team and appearing in four games with the USA Hockey National Team Development Program U18 team. He scored 3 goals with 4 assists and was plus-11 with 45 penalty minutes in 33 regular season games for the Knights. London finished third in the Midwest Division, advancing to the second round in the OHL playoffs, and participated in the Memorial Cup as the host team. Yakimowicz scored 2 goals and was plus-1 with 4 penalty minutes in nine OHL playoff games and had 1 assist in three games at the Memorial Cup. He was ranked 153rd in the Central Scouting final rankings and was selected by St. Louis in the sixth round (172nd overall) in the 2014 NHL Draft.
2014-15: Yakimowicz attended training camp with the Blues before returning to London for his first full OHL season with the Knights. He scored 13 goals with 20 assists and was +3 with 95 penalty minutes in 63 regular season games. London finished second in the Midwest Division and reached the second round in the playoffs. Yakimowicz scored 1 goal with 1 assist and was -8 with 20 penalty minutes in 10 playoff games.
2015-16: Yakimowicz returned to London to skate for the Knights, competing in his second Memorial Cup in three seasons. Frequently skating against the opposition’s top line with some of the high-end forward talent in London, he scored 6 goals with 5 assists and was -4 with 117 penalty minutes in 52 games, missing 12 games due to a suspension for an incident with Windsor’s Mads Eller. Yakimowicz scored two goals, including a game-winning goal in double overtime against Erie, in 18 OHL playoff games and was +1 with 4 assists and 10 penalty minutes. The Knights defeated Niagara in the OHL Finals to reach the Memorial Cup.
Yakimowicz is very good at using his size and bases his game mostly on the physical side. His skating is pretty good for his size and style, but he needs to keep developing the rest of his game to become a more complete player.
Yakimowicz played for a dominant London Knights team in 2015-16, providing secondary scoring on a team with scorers like Mitch Marner (TOR), Christian Dvorak (ARI), and likely 2016 first-round pick Matthew Tkachuk. Drafted by the Blues in 2014, he has yet to sign an entry-level contract and would re-enter the 2016 NHL Draft if not signed before then. Yakimowicz' combination of size and a big shot make him an intriguing power forward prospect. His defensive awareness projects an effective lower line checking forward at the minimum.