Keituri debuted in the Continental Cup in 2002. He won a bronze medal at the 2002 Junior World Championship in Schonach. On March 1, 2002 he made his debut during the Ski Jumping World Cup meeting in Lahti, finishing in 19th position and gaining 12 points. He finished the season in 66th position. In the next season, he was 26th in Lahti. In 2004 he did not participate in the World Cup.
The next year was Keituri's best as he reached a 9th position in the Continental Cup overall classification, gaining 540 points. In the World Cup he started in five competitions. In Lahti he was 22nd; then he finished 29th in Lillehammer and 22nd in Planica. He gained 22 points in the overall World Cup.
During the 2005/06 season his best performance was a ninth position in Titisee-Neustadt on January 22, 2006. In the end his Continental Cup position was only 67th. In the 2007 Ski Jumping World Cup he reached the ninth position in Kuusamo, which was his personal best. The largest jump in his career was 205.5 metres.
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