Sakon Yamamoto
In late 2008, Sekiguchi competed in the first round of the 2008–09 GP2 Asia Series season for the David Price Racing team. His team-mate was Michael Herck. He was the fourth Japanese driver in the championship, alongside Sakon Yamamoto, Kamui Kobayashi, and Hiroki Yoshimoto. However, he was then replaced by Giacomo Ricci from the second round onwards.