2010-11: Blake Siebenaler played forward for the Carroll Chargers high school team in Indiana and was the team’s leading scorer as a freshman. He scored 20 goals with 12 assists in 17 regular season games. Siebenaler scored 3 goals with 3 assists in four state tournament games and Carroll defeated Columbus to capture the Indiana 4A state championship.
2011-12: Siebenaler skated for the Cleveland Barons U16 midget and participated in USA Hockey’s Select 16 Festival in July 2012. He scored 5 goals with 7 assists and had 6 penalty minutes in 40 games as a defenseman for the Barons. Siebenaler was selected by Indiana in the second round (23rd overall) of the 2012 USHL Futures Draft and was selected by Niagara in the 15th round (302nd overall) in the OHL Priority Selection.
2012-13: Siebenaler played for the first-place USA U17 team at the Five Nations Tournament in the Czech Republic in August and appeared in 11 USHL games with Indiana; spending most of the season playing for the Belle Tire U16 team in Michigan. He had no points nor penalty minutes in four games with the USA. In 11 games for the Ice he was minus-11 with 1 goal, 2 assists and 8 penalty minutes. Siebenaler played 50 games with the Belle Tire U16 team. He scored 9 goals with 9 assists and had 22 penalty minutes in 39 regular season games and scored 4 goals with 3 assists in 11 playoff contests. He capped the season by participating in USA Hockey’s Select 17 Development Camp in July 2013.
2013-14: Siebenaler signed with the OHL’s Niagara Ice Dogs in August 2013; foregoing college hockey. One of three playmaking defensemen for the Ice Dogs, he scored 6 goals with 24 assists and was minus-16 with 24 penalty minutes in 68 regular season games. Niagara took eventual Eastern Conference champion North Bay to seven games in a first round series after finishing fourth in the Central Division behind the first-place Battalion. Siebenaler scored 1 goal with 3 assists and was plus-4 with 2 penalty minutes in seven playoff games. He was ranked 55th amongst North American skaters in the Central Scouting final rankings and was selected by Columbus in the third round (77th overall) in the 2014 NHL Draft.
2014-15: Siebenaler skated for the Columbus squad at the Traverse City rookie tournament and attended his first NHL training camp with the Blue Jackets before returning to Niagara for his second OHL season. In 66 regular season games with the IceDogs he scored 12 goals with 25 assists and was +7 with 30 penalty minutes. Niagara finished third in the Central Division and reached the second round in the playoffs. Siebenaler had 1 assist and was -1 with 8 penalty minutes in 11 playoff games. Siebenaler signed a three-year entry-level contract with Columbus in June 2015 .
2015-16: Siebenaler attended his second training camp with Columbus before returning to Niagara for his third OHL season. Skating in 65 of 68 regular season games for the IceDogs, he scored 7 goals with 22 assists and was +4 with 15 penalty minutes. Niagara finished third in the Central Division and reached the second round in the playoffs. Niagara finished third in the Central Division, facing the Ottawa 67’s in a first-round playoff series.
Siebenaler is extremely offensive minded and has the potential to be a force in the offensive zone. He is a good skater that is still learning when to join the rush. His passing is impressive and will only get better from this point. He has not displayed the consistency that an offensive defenseman should have, but that should come with time. Like many offensive-minded defenders, Siebenaler is going to have to fine tune his positioning in his own zone.
Siebenaler skated for the Niagara Ice Dogs in 2015-16 in his third major junior season. A team leader for one of the OHL's better teams, he has steadily gained more consistency while playing a skating, disciplined game. Siebenaler's understated, sound two-way game suggests he can be a reliable second or third pairing defenseman.