2007-08: Nick Mattson skated in 62 games for the US National U17 team and scored 1 goal with 19 assists. His 20 points were most amongst U17 NDTP defensemen. Mattson had 5 assists in six games at the U17 World Hockey Challenge.
2008-09: Mattson scored 4 goals with 19 assists in 63 games for the U18 USA National team and skated for the gold medal winning USA squad at the 2009 U18 World Junior Championship. In seven games at the world tournament he had 1 goal with 2 assists and was +1. Mattson committed to playing college hockey at North Dakota in 2011-12.
2009-10: Played for the USHL Indiana Ice, paired mostly with Taylor Boldt. Named to the 2010 USHL All-Star Game.
2010-11: Mattson skated in his second year in the USHL with Indiana, leading the team's defensemen with 6 goals and 36 points in 57 games. His plus-33 rating ranked third overall on the team. Mattson added 2 assists in 5 playoff games for the Ice.
2011-12: Mattson skated in all 42 games as a freshman at North Dakota and was frequently in one of the Fighting Sioux' top two defense pairings. He was the second leading scorer among a North Dakota defensemen corps that also featured fellow Chicago prospect Joe Gleason. Mattson scored 6 goals with 13 assists and was plus-five with 10 penalty minutes. North Daktota finished fourth in the WCHA and captured the Broadmoor Trophy playoff championship after back-to-back wins over Minnesota and Denver. Minnesota returned the favor in the NCAA West regional final, defeating North Dakota, 5-2 to end the Fighting Sioux season.
2012-13: Nick Mattson skated in 38 games in his sophomore season at North Dakota. Partnered with fellow Chicago prospect Joe Gleason part of the year, he scored 3 goals with 8 assists and was +8 with 8 penalty minutes. North Dakota finished third in the WCHA and earned an at-large bid to the NCAA tournament after an overtime loss to Colorado College in the WCHA Final Five semifinals. The Fighting Sioux lost to eventual national champion Yale, 4-1, in the NCAA West Regional Final.
Mattson is a two-way defender who improved late in the season. Very poised with the puck and makes good decisions. Strong skater. He needs to keep his game consistently high and bring an edge.
North Dakota will experience some turnover on the blue line going into the 2013-14 season after graduating two seniors and losing Derek Forbort to the pro ranks. Mattson, therefore, enters the year as one of the elder statesmen. With plenty of talent among the younger blueliners, Mattson will still have his work cut out for him when it comes to earning ice time.