Riksman played junior hockey in Espoon Palloseura and in the HIFK organization, but he started his pro career with Hermes of Kokkola, then in the 1st division.

When Tom Draper was hired as HIFK's starting goaltender, Riksman signed with MoDo Hockey in Sweden, and after two seasons in Sweden, a year in Italy with Alleghe HC and one season with Ilves, he led Ässät to a silver medal in 2006 and won the Urpo Ylönen trophy as the league's best goaltender.

In June 2007, the St. Louis Blues of the NHL signed Riksman to a contract.

Riksman appeared in his first and only professional game in North America on November 10 against the Rockford IceHogs, allowing two goals in only eight minutes of play.

After Peoria's loss to San Antonio on November 17, Riksman announced that he had quit the team and was returning to Finland, leading to a suspension by Rivermen general manager Kevin McDonald.