Koponen jumped in the Continental Cup (COC) from 1992 and was able to achieve a total of 20 COC points in his first season 1992/93 and was 46th overall at the end of the season.
At the Junior World Championships in 1994 in Breitenwang , he won the gold medal in a team competition with Jani Mattila , Janne Ahonen and Olli Happonen . A short time later he made his debut in the ski jumping World Cup while jumping on March 5, 1994 in Lahti . He finished jumping in 13th place and was able to win his first World Cup points in his first competition. He also made it into the points in the following competitions and ended the 1993/94 season with 74 points in 41st place in the overall World Cup ranking. For the 1994/95 season Koponen jumped again in the World Cup and the Continental Cup. He finished the Four Hills Tournament 1994/95 in the end in 39th place in the overall tournament ranking. He completed the jumping in the World Cup with varying results. So he rarely jumped into the points. He was denied a place in the top ten. At the end of the season he finished 47th in the overall World Cup ranking. The 1995/96 season was his most successful Continental Cup season. After various successes, he came in 8th place overall and scored a total of 524 COC points. The following years were largely unsuccessful for Koponen in both series. Only in his home town of Lahti was he able to jump into the top 20 in World Cup competitions. Lahti was also the location of his last World Cup jumping on March 8, 1998. The 1998/99 season he jumped exclusively in the Continental Cup. After only 19 points and 127th place in the overall standings, he ended his active ski jumping career.
Finland
