2004-05: Played for the Djurgarden Jr. U-20 team in Sweden.
2005-06: Played for Djurgarden Jr. U-20 in Sweden, where he posted a 2.40 GAA in 18 games with a .910 save percentage. Ridderwall also earned a shutout at the elite level.
2006-07: Ridderwall was the third string goaltender for the Djurgardens IF of the Swedish Elitserien and was thus assigned the task of playing for the team’s under-20 affiliate. Making the most of his playing time, this solid goaltending prospect played in 28 games for the Djurgarden IF J20 team. The numbers he posted were astounding — a 1.78 GAA and four shutouts. And just when one thought he couldn’t play any better, in the playoffs Ridderwall brought his game to a new level, playing in seven games and recording a playoff leading 1.44 GAA and .956 save percentage. His individual efforts, unfortunately, were not enough, as his team eventually fell to Frolunda in the championship series.
2007-08: Ridderwall saw time with several Swedish teams during the 2007-08 season. He started in the under-20 league and over eight games he posted a goals against average of 1.75 and a save percentage of .934. He moved up to the elite league for 11 games, posting a 2.68 goals against average and .907 save percentage.
2008-09: In 27 games with Djurgården, Ridderwall posted a .897 Save Percentage.
2009-10: In a breakout season, Ridderwall played hot for Djurgården, in 26 games, posting a .917 Save Percentage and 2.30 GAA.
Plays with a great love for the game and is very passionate on the ice. Displays good technique and is a technically skilled goalie; plays a mix of stand-up and butterfly style. Makes up for 5’11” frame by playing angles effectively and is not afraid to challenge shooters. Has quick reflexes and is quite good at covering the bottom portion of the net. Ranked 12th among European-born goalies entering 2006 draft. Shows great deal of raw skill set and has loads of potential.
Will continue playing in Sweden and is still years away from making a dent in the Isles organization.