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Tsuyoshi Kosaka
Statistics
Nickname	TK
Height	5 ft 11 in (180 cm)
Weight	225 lb (102 kg)
Nationality	Japanese
Born	March 6, 1970 (1970-03-06) (age 37)
Town of birth
Fighting style	Judo/Submission fighting
Mixed martial arts record
Wins	19
By knockout	6
By submission	5
Losses	11
Draws	1

Tsuyoshi "TK" Kosaka (March 6, 1970) is a retired Japanese mixed martial arts fighter. A 4 dan in Judo, he is one of Japan's most celebrated MMA fighters, and holds notable wins over Kimo Leopoldo, Mario Sperry, Egan Inoue and Fedor Emelianenko.

Kosaka is associated with the Alliance, the Yoshida Dojo, and his own fight team A-Square. He has a professional MMA record of 19-11-1 as of March 5, 2006.

He won the presitigious Lumox Cup tournament to begin his MMA career, beating out the likes of Akihiro Gono and Egan Inoue. TK has fought in many of the largest fight organizations in the world including the UFC, RINGS, Pancrase and PRIDE Fighting Championships. TK had been a RINGS superstar before heading over to the United States and participating in the UFC. He holds wins over UFC Veterans Kimo Leopoldo, Tim Lajcik, Pete Williams and Egan Inoue. A rather small heavyweight at 215 pounds, Kosaka has also defeated Ron Waterman and Ricardo Morais, both of whom weighed in for their contests against him in excess of 300 pounds. One of his biggest wins arrived late in his career, when he knocked out Brazilian Top Team coach Mario Sperry on the same day of his son's birth.

He also scored a TKO Cut victory over the current PRIDE Fighting Championships Heavyweight Champion Fedor Emelianenko, however the blow was an illegal elbow. The tournament structure required a winner and a loser, so Kosaka was given the win. Emelianenko avenged his loss by defeating Kosaka via TKO at PRIDE Bushido 6

TK is known for his great conditioning and grappling prowess which extends through the throws and takedowns of standing grappling to the positioning and submissions of groundwork. His "TK guard" is famous for its efficiency and Frank Shamrock and Maurice Smith have both credited him with having vastly improved their work from that particular position.

On October 2, 2005 TK would lose his Pancrase Superheavyweight Belt to up and comer Mike Kyle. He now owns and operates a dojo in Japan where he trains his A-Square team along with Hidehiko Yoshida and his stable.

He announced his intentions to retire upon losing any match in 2006. On May 5, 2006 he lost against Mark Hunt at PRIDE Total Elimination Absolute.

• Official blog
• Professional MMA record for Tsuyoshi Kohsaka from Sherdog