Here is a list of Chonan's best fights. For a list of Chonan's losses, refer to "Ryo Chonan Losses".
On February 5, 2006 Ryo Chonan fought Ryuta Sakurai in a middleweight title fight for Sakurai's DEEP Championship title. Chonan was 29 years old and with a record of 11-6 (6), and Sakurai was 34 years old and with a record of 12-10-4 (9). Chonan stopped Ryuta Sakurai via 1st-round TKO and is crowned the new DEEP middleweight champion.
On October 20, 2013 Ryo Chonan fought Dan Hornbuckle in a welterweight title fight for Hornbuckle's DEEP Championship title. Chonan was 37 years old and with a record of 22-13 (9), and Hornbuckle was 32 years old and with a record of 24-6 (20). Chonan won the fight via 3-round unanimous decision and is crowned the new DEEP welterweight champion.
On February 16, 2007 Ryo Chonan met Ryuta Sakurai in a middleweight (DEEP Championship) title defense fight. Chonan was 30 years old and with a record of 13-7 (6), and Sakurai was 35 years old and with a record of 14-11-4 (10). Chonan won the fight via 3-round majority decision and successfully defended his title.
On February 12, 2005 Ryo Chonan faced off against Roan Carneiro at age 28. He was coming in with a record of 9-4 (5), and Carneiro was 26 years old and with a record of 5-2 (4). Chonan stopped Roan Carneiro via TKO.
On January 22, 2004 Ryo Chonan faced off against Daijiro Matsui at age 27. He was coming in with a record of 6-3 (3), and Matsui was 31 years old and with a record of 6-10-2 (0). Chonan won the fight via 3-round majority decision.
On October 14, 2004 Ryo Chonan faced off against Carlos Newton at age 28. He was coming in with a record of 7-4 (3), and Newton was 28 years old and with a record of 13-9 (10). Chonan won the fight via 2-round unanimous decision.
On May 22, 2005 Ryo Chonan faced off against Nino Schembri at age 28. He was coming in with a record of 10-4 (5), and Schembri was 30 years old and with a record of 3-2 (2). Chonan won the fight via 2-round unanimous decision.
On September 6, 2008 Ryo Chonan faced off against Roan Carneiro in a middleweight bout at age 31. He was coming in with a record of 15-8 (7), and Carneiro was 30 years old and with a record of 12-7 (7). Chonan won the fight via 3-round split decision.
On June 4, 2006 Ryo Chonan faced off against Joey Villaseñor in a welterweight bout at age 29. He was coming in with a record of 12-6 (6), and Villaseñor was 30 years old and with a record of 21-3 (19). Chonan won the fight via 2-round split decision.
On April 28, 2013 Ryo Chonan faced off against Seichi Ikemoto in a middleweight bout at age 36. He was coming in with a record of 21-13 (9), and Ikemoto was 37 years old and with a record of 21-18-5 (12). Chonan won the fight via 3-round unanimous decision.
