|Full name||Kentaro Oi|
|Date of birth||May 14, 1984|
|Place of birth||Fujieda, Shizuoka, Japan|
|Height||1.80 m (5 ft 11 in)|
|Playing position||Centre back|
|2000–2002||Fujieda Higashi High School|
|* Senior club appearances and goals counted for the domestic league only and correct as of 23 February 2018
Oi was educated at and played for Fujieda-higashi high school, during which time he was also a member of the U-17 Japanese national team for the 2001 FIFA U-17 World Championship. Oi played 3 games in the competition but the team was eliminated after the group stage.
After graduation from school in 2003, Oi signed with the local club, Júbilo Iwata. He made his professional debut on 16 July 2003 in the J. League Cup match against Tokyo Verdy. His first league start at Kobe Wing Stadium in the 2–1 defeat to Vissel Kobe on 26 September 2004. He was a first team regular in the 2007 season, appearing in 26 games. In 2011, Oi joined Shonan Bellmare on a one-year loan. He made 36 league appearances for Bellmare, scoring 2 goals. At the end of his loan at Bellmare, he turned down the opportunity to sign a new contract with Jubilo Iwata.
|Club performance||League||Emperor's Cup||J. League Cup||Asia||Total|
|2003||Júbilo Iwata||J1 League||0||0||0||0||1||0||–||1||0|
|2011||Shonan Bellmare||J2 League||36||2||1||1||–||–||37||3|
|2012||Albirex Niigata||J1 League||14||0||2||0||4||0||–||20||0|
- "FIFA Player Statistics: Kentaro OI". FIFA.com. Retrieved 7 January 2011.
- "Kobe vs Iwata" (in Japanese). J's Goal. 26 September 2004. Archived from the original on 3 August 2012. Retrieved 7 January 2012.
- "Oi join Bellmare" (in Japanese). J's Goal. 23 December 2010. Archived from the original on 2 August 2012. Retrieved 7 January 2012.
- "Oi completed a permanent move to Albirex Niigata" (in Japanese). Albirex Niigata. 7 January 2011. Retrieved 7 January 2011.
- Nippon Sports Kikaku Publishing inc./日本スポーツ企画出版社, "J1&J2&J3選手名鑑ハンディ版 2018 (NSK MOOK)", 7 February 2018, Japan, ISBN 978-4905411529 (p. 48 out of 289)
- Nippon Sports Kikaku Publishing inc./日本スポーツ企画出版社, "2017 J1&J2&J3選手名鑑 (NSK MOOK)", 8 February 2017, Japan, ISBN 978-4905411420 (p. 104 out of 289)
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