2010-11: Marcus Pettersson played for the Skelleftea club in northern Sweden and skated for bronze medal-winning Vasterbotten in the TV-Pucken tournament for high school players. He skated in two Allsvenskan U18 games with no points or penalties and had 1 assist in three games for the club’s top U16 team. Petterson scored 3 goals with 4 assists and 4 penalty minutes in eight TV-Pucken games.
2011-12: Pettersson skated for Skelleftea’s silver medal-winning U18 team, played 10 international contests with Sweden’s U16 team and was a team captain for TV-Pucken champion Vasterbotten. He scored 5 goals with 7 assists and was +17 with 12 penalty minutes in 33 regular season games for the U18 team. Pettersson scored 1 goal with 3 assists and was +8 with 14 penalty minutes in seven playoff games. He was +15 with 1 goal, 1 assist and 4 penalty minutes in 10 games for Sweden’s U16 squad. He scored 4 goals with 5 assists and was +11 with 8 penalty minutes in eight TV-Pucken games.
2012-13: Pettersson competed for Skelleftea in Sweden’s U20 SuperElit league as a 16-year-old and played for Sweden in the 2013 World U17 Hockey Challenge. He scored 4 goals with 8 assists and was +4 with 16 penalty minutes in 37 regular season games and was -1 with no points nor penalties in two SuperElit playoff games. Pettersson had no points and 4 penalty minutes in six games at the WHC. Sweden defeated Russia, 7-5, in the gold medal game.
2013-14: Petterson made his pro hockey debut with Skelleftea in Sweden’s SHL and is an assistant captain for the club’s U20 team. He was +2 with no points and 2 penalty minutes in his first 10 SHL games. Pettersson scored 2 goals with 11 assists and was +1 with 34 penalty minutes in his first 27 SuperElit league U20 games. He was ranked 10th amongst International skaters in Central Scouting’s mid-term rankings prior to the 2014 NHL Draft.
Pettersson is a tall, intelligent defenseman who has a long reach and rarely allows opponents to get around him, gobbling them up as they try to pass. He uses his sizes effectively in orchestrating a very effective pokecheck. Has a strong sense of positioning as well as when he should play aggressively or conservatively. Despite his size and lankiness, he’s got both good east-west as well as backwards mobility. Pettersson's first pass is almost always on the money and he doesn’t hesitate to curl the puck back into his zone to regroup when necessary. In general, he displays above-average offensive instincts in all three zones. His shot is on target and particularly his wrist shot can come at a surprising velocity. Physically impressive from a height standpoint at such a young age, his frame is ripe for another 40 pounds in the coming years. His developmental curve has also been extremely impressive as he irons out holes in his game at a rapid rate. Also taking his confidence and ability to read the game into account, Pettersson's upside seems to be limitless at this juncture.
Still lanky, Pettersson can have problems in the physical department. At times, he seems to lose his own balance while pushing and prodding opponents who have better core strength. Desperately needs to put on weight to be effective at the next level. If deked out, he does need more time to recover and his defensive game is, overall, still in need of improvement. Still very raw after having been a forward until the age of 16, the lack of coaching as a defenseman is apparent.
Pettersson is a long-term project in terms of his NHL potential. His skating ability, size and awareness suggest he can be an effective two-way defender eventually but does not play an overly abrasive style for a player his size and will need to improve his agility and strength if he is to compete on a nightly basis.