In 2001, British team
King's Lynn Stars noticed Iversen and signed him for the last three meetings of the
2001 Elite League speedway season. He was selected for the Denmark squad at the
Speedway World Cup in August 2003: ten points from five rides helped Denmark through to the Grand Final where he and
Kenneth Bjerre were replaced. Iversen signed for Swedish club
Västervik Speedway in the
Elitserien and
Wrocław in Poland. Oxford also signed Iversen for the 2004 season as a full-time Elite League rider, after he had earned a 6.57 point average over 32 meetings the previous year. 2005 saw Iversen move to
Rybnik in the Polish league and win the Elitserien with Swedish Club Vastervik, as well as being selected for Denmark's World Cup team where once again he hit double figures in the qualification round. The final was won by Poland but Iversen had earned himself a bronze medal for the third time. In Britain, Oxford retained his services for the season, where he won the
Craven Shield. In 2007, for the fifth season in a row Iversen was selected for his country and was part of the Danish team that finished second to Poland in the World Cup Final at
Leszno on 21 July. His Danish team Holsted enjoyed success in the Superleague Championship and in Sweden, Vastervik side made it through to the Elitserien playoff finals. At the
2007 Grand Prix challenge Iversen won the final at
Vojens resulting in qualification as a full-time member for the second time in the Grand Prix series. During the
2008 Speedway Grand Prix season Iversen crashed in the Swedish Grand Prix and broke his shoulder and at the end of the season he finished outside the automatic qualification places in 12th place. Selected for the World cup again, Iversen and the Danish team earned victory in the 2008 final and giving him his second Gold Medal. Brought back to Peterborough in 2009, Iversen became the captain of the Panthers and based himself in the city. and stayed with Zielona Góra in the Polish Extraliga. In Denmark, he moved back to Holsted after a year away from the club while in Sweden he moved from Vastervik to
Indianerna. On 31 August, Iversen was selected for a wildcard place at the Nordic Grand Prix on 11 September. In 2011, Iversen left Peterborough and joined the
King's Lynn Stars, who had moved up to the
Elite League. He remained with King's Lynn for six years. Over the next few years from 2013 to 2016 Iversen would establish himself as one of the world’s elite riders. He collected the bronze medal on his series return in 2013 and won five grand prix during that period, including a home win at the
Parken Stadium in 2014. Also in 2014 he won his fourth
World Cup gold medal, overtaking Poland’s
Janusz Kolodziej on the final bend of the final heat to seal the title. He would also claim seven consecutive Danish Individual Championships from 2012 to 2018. League success would also come during this period, he joined
Stal Gorzów in 2012 and would be a major contributor to title wins in 2014 and 2016, as well as adding a second Swedish
Elitserien with
Smederna in 2018. He continued to appear in the World Championship until the end of the
2020 Speedway Grand Prix. His last appearance for Denmark came at the
2019 Speedway of Nations. In 2022, he returned to ride for the King's Lynn Stars in the
SGB Premiership 2022 and then returned to Peterborough for the
SGB Premiership 2023. In 2023, he helped
Esbjerg Vikings win the
Danish League. In 2024, he switched back to riding for King's Lynn Stars following the demise of Peterborough. ==Major results==