Korpisalo played professionally in his native Finland in the
SM-liiga during the
2012–13 and
2013–14 seasons for
Jokerit and
Ilves respectively.
Columbus Blue Jackets (2014–2023) Korpisalo was selected by the Blue Jackets in the third round (62nd overall) of the
2012 NHL entry draft. On 21 March 2014, the Blue Jackets signed Korpisalo to a three-year, entry-level contract. in
2016.|left During the latter half of the
2016–17 NHL season, Korpisalo took over as the Blue Jackets' backup goaltender behind
Sergei Bobrovsky. On 9 June 2017, the Blue Jackets signed Korpisalo to a two-year contract extension. When Bobrovsky left to the
Florida Panthers in free agency before the
2019–20 season, Korpisalo became the Blue Jackets' starting goaltender. However, after injuring his knee in a shootout loss to the
Chicago Blackhawks on 29 December, rookie goaltender
Elvis Merzļikins started in his absence. On 17 April 2020, Korpisalo signed a two-year contract extension worth $5.6 million to stay with the Blue Jackets. Korpisalo hung onto the starting job for the
2020 Stanley Cup playoffs, and made his NHL playoff debut for the Blue Jackets on 2 August 2020. Korpisalo did not allow a goal against the
Toronto Maple Leafs in a 2–0 victory, the first Blue Jackets goaltender to record a shutout in the playoffs. On 9 August 2020, Korpisalo would again shut out the Maple Leafs by a 3–0 score, eliminating them from the playoffs and securing a series win for the Blue Jackets. In game one of the Blue Jackets'
first-round series, Korpisalo set a modern NHL record for saves in a single game with 85, despite a 3–2 defeat in quintuple overtime versus the
Tampa Bay Lightning. His performance surpassed the previous modern record of 73 by
Kelly Hrudey in the
Easter Epic 33 years prior, and was eight short of the all-time record of 92 set by
Detroit Red Wings goaltender
Normie Smith in the
1936 NHL playoffs.
Los Angeles Kings (2023) During the season, his ninth season within the Blue Jackets organization, Korpisalo was traded with
Vladislav Gavrikov to the
Los Angeles Kings in exchange for
Jonathan Quick, a conditional first-round pick in
2023, and a third-round pick in
2024 on 1 March 2023. Acquired to assume the role as the Kings starting goaltender, Korpisalo had an impressive end to the regular season in collecting 7 wins through 11 appearances. In the post-season, Korpisalo was unable to help the Kings advance past the first round, losing in six games against the
Edmonton Oilers.
Ottawa Senators (2023–2024) in 2024. As a free agent at the conclusion of his contract with the Kings, Korpisalo was signed on the opening day of free agency to a five-year, $20 million contract with the Ottawa Senators on 1 July 2023.
Boston Bruins (2024–present) On 24 June 2024, Korpisalo was traded alongside
Mark Kastelic and a
2024 first-round pick to the
Boston Bruins, in exchange for
Linus Ullmark. Korpisalo was slated to be the backup to fellow netminder
Jeremy Swayman for the
2024–25 season. However, due to contract negotiations between the Bruins and Swayman, it caused Swayman to miss training camp, and as a result, Korpisalo was given the nod to start on Opening Night for the Bruins. Korpisalo and the Bruins lost the first game, 6–4, to the
Florida Panthers. Just a few games later, in his second start for the Bruins, Korpisalo earned his first win in the black and gold, a 5–3 victory over the
Colorado Avalanche. He earned his first shutout as a Bruin on 2 November 2024, in a 3–0 win over the
Philadelphia Flyers. Korpisalo proved himself to be a solid backup for the Bruins in what many saw as a bounceback season for him. Many even saw him as having potential to take the starting job away from Swayman, due to both the Bruins and Swayman's struggles. Korpisalo finished the season 11–10–3 in 27 games, with a 2.90 GAA, and a career high three shutouts. On 11 April 2025, Korpisalo was named the Bruins nominee for the
Bill Masterton Memorial Trophy, awarded to players who "exemplify perseverance, sportsmanship and dedication to hockey." ==International play==