At domestic level, Onozawa has played his entire professional career with Suntory Sungoliath who he joined in 2000.
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Hirotoki Onozawa (小野澤宏時) (born March 29, 1978 in Shimada, Shizuoka, Japan) is rugby union who plays at wing (and sometimes full back) Suntory Sungoliath and the Japan national rugby union team.
He returned to play in the Pacific Rugby Cup for Junior Japan in March 2013, and then returned to the Japan national team after an injury to Hirotoki Onozawa and scored tries on his return in all three of the matches he played in the Asian 5 Nations.