Kentaro Oi

After graduation from Fujieda Higashi High 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. On 7 January 2011, Oi completed a permanent move to Albirex Niigata.

Oi was a member of the Japan U-17 national team for the 2001 U-17 World Championship. Oi played 3 games in the competition but the team was eliminated after the group stage.