Heiskanen played hockey until the age of 14 in the youth program of the Finnish Liiga club Espoo Blues. Later, Heiskanen played within the youth program of HIFK. In playing at the Junior A level during the 2015–16 season, he recorded 14 points in 30 games to be awarded with the Yrjö Hakala Award as rookie of the year.[2] On 30 May 2016, he signed a three-year contract extension with the HIFK organization.[3]
During the 2016–17 Liiga season, at age 17, Heiskanen made his professional debut with HIFK in the Liiga. In playing the full season in the Liiga, he played on HIFK's top defensive pairing, scoring 5 goals and 10 points in 37 games.[4] HIFK head coach Antti Törmänen described him as his team's best defenceman that season, praising his ability to always make the right decisions. By the end of the season, Heiskanen was considered a top prospect at the 2017 NHL Entry Draft, with Göran Stubb of the NHL Central Scouting Bureau describing him as "by far the best European defenceman in the draft".[5] Heiskanen was ultimately selected third overall by the Dallas Stars.[6]
On 8 July 2017, Heiskanen signed a three-year, entry-level contract with the Stars.[7] Heiskanen spent the 2017–18 Liiga season on loan with HIFK.[8]
Dallas Stars (2018–present)
Heiskanen was named to the Stars' roster to start the 2018–19 NHL season[9] and made his debut on 4 October in a 3–0 win over the Arizona Coyotes.[10] On 25 October, in a 5–2 Stars win over the Anaheim Ducks, Heiskanen scored his first career NHL goal, beating goaltender John Gibson off a pass from Jason Spezza. In so doing, at 19 years and 99 days, Heiskanen became the second-youngest Stars defenceman to score a goal in the franchise's history.[11] On 2 January 2019, Heiskanen was named the Stars' lone representative at the 2019 NHL All-Star Game, becoming the second rookie in the Stars/North Stars franchise history to be named to the All-Star Game. At the time of his selection, he was tied for seventh in the league among rookies and second among rookie defencemen with 17 points.[12] After the Stars qualified for the 2019 Stanley Cup playoffs, Heiskanen became the third defencemen under the age of 20 to score two goals in a playoff game.[13]
Heiskanen being checked by Yanni Gourde during a game in 2023.
On 17 July 2021, Heiskanen signed an eight-year, $67.6 million contract with the Stars.[14]
In the 2022–23 season, Heiskanen broke the record for most points in a season by a Stars defenceman, recording 11 goals and 62 assists for 73 points. The record was previously held by Sergei Zubov. His 73 points also tied former New York Rangers defenceman Reijo Ruotsalainen's record for most points in an NHL season by a Finnish-born defenceman.[15]
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