2010-11: Lucas Wallmark moved from Bjorkloven to Skelleftea — skating for the club's U18 team — appeared in three games with Sweden's U17 team, and played in his second TV-Pucken tournament for Sweden's high school players. He scored 18 goals with 49 assists and had 18 penalty minutes in 36 games for Skelleftea. Wallmark had one assist with Sweden's U17 team. He was a team captain for bronze medal-winning Vasterbotten, scoring 5 goals with 11 assists and 12 penalty minutes in eight TV-Pucken games.
2011-12: Wallmark skated for Skelleftea's U20 team as a a 16-year-old and represented Sweden at the U18 and U17 levels. He had 1 assist and was -1 in five games for Sweden at the 2012 Ivan Hlinka Memorial Tournament in August before returning to Skelleftea. In 40 games (including three playoff contests) he scored 12 goals with 28 assists and was +16 with 18 penalty minutes. He played eight games for Sweden's U18 team, with 4 assists and 6 penalty minutes, and was +2 with 2 assists and 2 penalty minutes in six games for the Sweden U17 team.
2012-13: Wallmark dressed for two Elitserien games with Skelleftea as a 17-year-old and split the year between the club's U20 team and Karlskrona's men's team in Allsvenskan. He played in his second Ivan Hlinka Tournament and and at the 2013 World Junior Championship in Sochi with Sweden's U18 team. Wallmark had no points nor penalty minutes in Elitserien play. He scored 5 goals with 10 assists and was -4 with 6 penalty minutes in 23 Allsvenskan games (including seven playoff contests). He was an assistant captain and was +5 with 18 penalty minutes, scoring 5 goals with 11 assists, in 16 SuperElit games for Skelleftea's U20 team. He scored 4 goals with 3 assists and was +4 with 2 penalty minutes in five games at the Ivan Hlinka tournament and scored 2 goals with 3 assists and 2 penalty minutes in five games at the WJC. Wallmark was ranked 16th amongst International skaters in Central Scouting's final rankings prior to the 2013 NHL Draft but was not selected.
2013-14: Wallmark skated for Lulea in the re-christened SHL after signing a two-year contract with the club in May 2013. He spent time with Asploven in Allsvenskan and played for Sweden's silver medal U20 squad at the 2014 World Junior Championship. He scored 3 goals with 5 assists in seven games at the WJC and was +5 with 2 penalty minutes. Sweden lost to Finland, 3-2 in overtime in the gold medal game. Wallmark was ranked 24th amongst European skaters in Central Scouting's mid-term rankings prior to the 2014 NHL Draft.
Wallmark has very good hockey sense and in-game, on-ice intelligence. His skill set is akin to the top Swedish offensive players in recent years. He’s a creative player who can be a real strength on the power play, where he likes to quarterback things from the right faceoff circle. This is his second year of draft eligibility and he took the step to the SHL, showing an ability to do whatever was necessary to stick around. Wallmark is a hard worker who doesn’t give up on pucks easy. Although often giving a plodding impression, he does move his feet and hangs around. Strong at using his body to protect the puck. Good vision and has shown himself to be both a goal-scorer and playmaker, depending on what’s needed of him most at certain junctures of a game, but he'll likely always be more of a set-up man. Wallmark spent this winter proving that he has an aptitude for the two-way game. Has also come to hone his face-off skills into a strength.
Wallmark's skating is an issue. It hasn’t held him back too much for now, but it won’t make things easy for his becoming an impact player. He’s also still a bit on the small side and this has been noticeable at the pro level. There is some questioning of Wallmark's mental fortitude and one has to wonder if there weren’t some off-ice issues that prevented him from being drafted last summer.