At the 2006 Asian Indoor Athletics Championships he missed out on a medal in the indoor heptathlon, although he achieved 5340 points in his first major outing in the event. He scored a personal best total of 7803 points for decathlon in Kanazawa in June 2006,[4] but at his first Asian Games that year he was far off this form and, after he failed to produce a mark in the pole vault, he finished in tenth place.[5] As the reigning national champion, Tanaka gained selection for the 2007 World Championships in Athletics, held in Osaka, and he finished in 19th place overall.[6]