2008-09: Colin Suellentrop played for the Detroit Compuware U-16s and had 20 points in 54 games. He was selected by the Oshawa Generals in the 3rd round (44th overall) of the 2009 OHL Priority Draft.
2009-10: Suellentrop showed improvement after struggling early in his first OHL season for an Oshawa squad that finished fourth in the OHL's East division and did not make the playoffs. Suellentrop played in 54 games for the Generals; scoring 1 goal with 5 assists with 74 PMs. Suellentrop's -37 plus/minus was the lowest on the team. The Plantation, FL native also represented the Southeastern district at USA Hockey's Select 17 Festival.
2010-11: Both Oshawa and Suellentrop had a huge turnaround season. The Generals finished second in the East division and defeated Kingston in the first round of the playoffs before falling to Niagara in the quarterfinals. Suellentrop's game blossomed in his second season, perhaps due to the addition of one-time NHL defenseman and former General Joe Cirella as an assistant coach. In 59 games Suellentrop had 14 assists and his +21 plus/minus was the team's second-best. In ten playoff games, Suellentrop had 2 assists and 6 PMs with an even plus/minus. Suellentrop was ranked 140th amongst North American skaters in Central Scouting's final rankings and was selected by the Flyers in the 4th round (116th overall) in the 2011 NHL Draft.
2011-12: Suellentrop skated in 67 of 68 games for the Oshawa Generals in his third OHL season. Playiing a traditional defense-first game, he chipped in offensively with 2 goals and 15 assists and was plus-10 with 70 penalty minutes. After getting off to a slow start, the Generals rallied late in the season to earn a playoff spot. Suellentrop had 2 assists and was an even plus-minus with 4 penalty minutes in six playoff games against Niagara.
Suellentrop is a big, stay-at-home defenseman whose game is just beginning to evolve. His biggest assets are his size, reach and skating ability and he is also adept at distributing the puck to transition from defense to attack. Suellentrop has made great progress over the past three seasons and should continue to develop as he matures physically.
Suellentrop is playing for the OHL's Oshawa Generals in 2012-13. At the pro level, Suellentrop's size, strength and skating ability project him to be a prototypical shut-down, defensive defenseman.