Regular season

Ässät started their season with two wins by beating both Lukko and TPS 3–0. In the third match, Ässät lost 6–0 to Kärpät.^[3] After that, Ässät played with a win-loss-win pace, until both started to come in short bursts. By the end of the year, Ässät was below the playoff line and it had to sell its first line center Stephen Dixon to the KHL.^[4][5] After losing four matches in a row after winning three matches in January 2013, Ässät started a long, 14-match winning streak, during which Ässät conceded only 15 goals. Two of the wins came in extra time. During the winning streak, Ässät only conceded more than two goals in one match, when the Blues scored three goals against Ässät. The winning streak was broken at home with an overtime loss against Kärpät, after which Ässät won its last regular season game away against TPS in overtime. Ässät thus won 15 of their last 16 regular season matches and collected at least one point in each match. The winning streak in question was at the same time the longest winning streak in the club's history and the second longest winning streak in the SM-liiga history together with the Kärpät's winning streak in the 2006–2007 season (14 matches).^[6]

Playoffs

In the quarter-finals, Ässät faced KalPa. Ässät won the first three matches of the series, but lost the fourth match with a score of 5–0. Ässät won the fifth match 3–0 and thus progressed to the semi-finals with a 4–1 series win.^[7][8][9]

In the semi-finals, Ässät faced JYP. The series largely followed the same pattern as the KalPa series, except that the matches were clearly more even. Beforehand, JYP the favorite to win the series, because in the previous season it had knocked down Ässät in the quarterfinals with a straight win 4–0. However, despite JYP's home advantage, Ässät won the first three matches of the series again, but this time also the first cut-off match proved to be difficult as JYP took the away win with goals 1–2. In the fifth match, Ässät won away with 0–1 goals and advanced to the finals with 1–4 wins. The place in the finals was their first since 2006.^[10][11]

In the finals, Ässät faced the Jukka Rautakorpi coached Tappara. After the first four matches, the series was even 2–2. Tappara narrowly won the opening match in Tampere 2–1 after scoring the winning goal just five seconds before the end of the last period.^[12][13] In the second match, Ässät defeated Tappara at home with clear numbers 5–1.^[14] The third match in Tampere was close again, as Tappara equalized with a dominant force in the 53rd minute and scored the winning goal just one second before the end of the match. Tappara won the match 3–2.^[15] In the fourth match, Ässät defeated Tappara again with four goals, winning 4–0 at home.^[16] The culmination of the series was the fifth match in Tampere. After Tappara's Jarno Koskiranta scored the opening goal at the beginning of the second period, Ässät's Eero Elo tied the match during the same period. In a 1-1 tie, the game went to overtime. Only in the third overtime, at 108:59, Ässät's Veli-Matti Savinainen scored the winning goal of the match and thus Ässät took the first match ball.^[17][18] Tappara still had a chance to take the decision to the seventh match by winning the sixth match in Pori. Ässät won the match with goals 3–2 and thus achieved the Finnish championship with 2–4 wins.^[1][19][20]

Skaters

Source: QuantHockey^[21]

Goaltenders

^†Transferred to Ässät mid-season. Stats reflect time with Ässät only.

^‡Transferred to another team mid-season. Stats reflect time with Ässät only.

Bold/italics denotes franchise record