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.
On February 24, 2008 Suntory Sungoliath coached by Kiyomiya-san defeated Sanyo Wild Knights in the final of the Microsoft Cup to become the champions of the 2007-08 Top League.
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From 2001-6 he was a very successful coach of Waseda University Rugby Football Club leading them to three university championships in five years, including successive championships in 2005 and 2006, and he has now returned to Suntory Sungoliath in the Top League as their full-time professional head coach.
While competing for the England Sevens, Oduoza announced that he would be leaving Worcester for Japanese side Suntory Sungoliath after the 2007–08 season.
He graduated from Meiji University and used to play for Suntory Sungoliath before he went to play professional rugby in France for about one season.