His first club was Malmi Super-Koris ("Malmi super-basketball"), from where he joined one of Finland's top clubs, Espoo Honka in 2004–05 season. Under the guidance of coach Mihailo Pavićević, he quickly developed into a key component of Honka's Finnish League championship-winning side in 2006–07. During the 2006–07 campaign Koponen averaged 12.4 points, 2.4 rebounds and 3.7 assists per game.[citation needed]
Koponen played in the World All-Star team at the Nike Hoop Summit in 2007. He recorded 7 points and 6 assists with only one turnover, playing against future NBA super star, MVP Derrick Rose.[citation needed]
Koponen began his mandatory military service in the Lahti Military Academy in October 2007, participating in a special military service built for professional athletes such as Finnish tennis player Jarkko Nieminen. The 2007–08 Finnish League season began slowly, with Koponen trying to adapt to the military recruit training. Koponen struggled a lot in the opening month of the season, but found his rhythm in November, recording 21.4 points, 4.1 assists, 3.9 rebounds and 2.1 steals a game while draining 55.6% of his 2-point attempts, 45.8% of his 3-point attempts and 81.0% of his free throws. In the first game of December, Koponen played through a concussion and led the Honka Playboys to an overtime victory over Team Componenta, scoring 32 points, grabbing six rebounds and dishing out five assists. After the game, the concussion forced Koponen to be sidelined for a week.[citation needed]
In August 2008, Koponen signed a four-year deal with the Italian team Virtus Bologna.[2]
Khimki (2012–2016)
On 31 May 2012, Koponen signed a three-year contract with the Russian team Khimki.[3] On 27 March 2015, he re-signed with Khimki for two more years.[4] With Khimki he won the 2014–15 EuroCup season, and was also named to the All-EuroCup First Team.[5][6]
Barcelona (2016–2018)
On 16 August 2016, Koponen signed a three-year contract with Spanish powerhouse Barcelona.[7] One month later, he would suffer a traffic accident that caused him a head injury.[8] On 29 June 2018 Barcelona part ways with him.[9]
On 13 August 2021, Koponen returned to Finland in the Korisliiga, signing for Helsinki Seagulls.[12] He retired from his professional club career after the 2021–2022 season, due to consecutive hip problems.
NBA draft rights
On 28 June 2007, Koponen was taken 30th overall in the 2007 NBA draft by the Philadelphia 76ers. He was the final first-round pick in the draft. Philadelphia then traded Koponen to the Portland Trail Blazers in exchange for Derrick Byars and cash considerations. On 23 June 2011, Koponen's rights were traded to the Dallas Mavericks for the Mavericks' second round pick in the 2011 draft (57). On 27 June 2024, Koponen’s rights were traded to the New York Knicks.[13]
National team career
Koponen played for the Finnish national youth teams in 2004, 2005 and 2006.[14]