Here is a list of Kosaka's best fights. For a list of Kosaka's losses, refer to "Tsuyoshi Kosaka Losses".
On July 16, 1999 Tsuyoshi Kosaka faced off against Tim Lajcik in a heavyweight bout at age 29. He was coming in with a record of 16-8-1 (10), and Lajcik was 34 years old and with a record of 4-0 (4). Kosaka stopped Tim Lajcik via TKO.
On December 22, 2000 Tsuyoshi Kosaka faced off against Fedor Emelianenko in a heavyweight bout at age 30. He was coming in with a record of 22-10-2 (13), and Emelianenko was 24 years old and with a record of 4-0 (3). Kosaka stopped Fedor Emelianenko via TKO.
On February 26, 2006 Tsuyoshi Kosaka faced off against Mario Sperry in a heavyweight bout at age 35. He was coming in with a record of 28-17-2 (17), and Sperry was 39 years old and with a record of 12-3 (9). Kosaka stopped Mario Sperry via KO.
On May 29, 1998 Tsuyoshi Kosaka faced off against Volk Han at age 28. He was coming in with a record of 14-5 (9), and Han was 37 years old and with a record of 12-4 (6). Kosaka stopped Volk Han via submission.
On March 13, 1998 Tsuyoshi Kosaka faced off against Kimo Leopoldo at age 28. He was coming in with a record of 13-5 (8), and Leopoldo was 30 years old and with a record of 8-2-1 (8). Kosaka won the fight via 1-round unanimous decision.
On December 22, 2000 Tsuyoshi Kosaka faced off against Mikhail Ilyukhin in a heavyweight bout at age 30. He was coming in with a record of 21-10-2 (12), and Ilyukhin was 34 years old and with a record of 24-9 (22). Kosaka stopped Mikhail Ilyukhin via KO.
On December 22, 1999 Tsuyoshi Kosaka faced off against Chris Haseman in a heavyweight bout at age 29. He was coming in with a record of 18-9-1 (10), and Haseman was 30 years old and with a record of 8-5 (7). Kosaka won the fight via 1-round split decision.
On October 16, 1998 Tsuyoshi Kosaka faced off against Pete Williams in a heavyweight bout at age 28. He was coming in with a record of 15-5-1 (9), and Williams was 23 years old and with a record of 8-1 (6). Kosaka won the fight via 1-round unanimous decision.
On February 18, 1996 Tsuyoshi Kosaka faced off against Willie Peeters at age 25. He was coming in with a record of 6-0 (5), and Peeters was 30 years old and with a record of 1-1 (0). Kosaka stopped Willie Peeters via submission.
On November 7, 2004 Tsuyoshi Kosaka fought Ron Waterman in a heavyweight title fight for Waterman's Pancrase Super Championship title. Kosaka was 34 years old and with a record of 26-15-2 (15), and Waterman was 38 years old and with a record of 12-2-2 (11). Kosaka won the fight via 3-round unanimous decision and is crowned the new Pancrase heavyweight champion.
