After working as W*ING's ace from 1992-1993, Matsunaga left the company and returned to FMW where he headlined the successful 1993 Year End Spectacular event against Atsushi Onita.
Matsunaga was initially trained in martial arts and worked for the World Karate Association (WKA) organization.
[3] Matsunaga headlined the Battle Creation event on December 10 at the Korakuen Hall in Tokyo by teaming with Jerry Blayman against Onita and Tarzan Goto in the company's first-ever barbed wire deathmatch and the first-ever deathmatch in Japan, which Matsunaga and Blayman lost.
Matsunaga then participated in the Battle Resistance Tournament on January 7, 1990, in which he defeated Katsuji Ueda via disqualification in the first round before losing to eventual winner Masanobu Kurisu in the quarterfinals.
[17][18] On April 3, 1993, Matsunaga won his first title, the promotion's World Tag Team Championship with Yukihiro Kanemura by defeating Freddie Krueger and Leatherface.
He teamed with Pogo to defeat Atsushi Onita and Mr. Gannosuke in a No Ropes Barbed Wire Street Fight Deathmatch.
[29] After the match, Matsunaga made friends with Onita and turned fan favorite as he joined the FMW side to feud with Pogo and his entourage.
At FMW 5th Anniversary Show on May 5, 1994, Matsunaga and Tarzan Goto unsuccessfully challenged Pogo and Hisakatsu Oya for the Brass Knuckles Tag Team Championship.
[32] Matsunaga had gained fame for his deathmatch wrestling style and was considered by Onita to succeed him as FMW's ace after Onita's retirement at FMW 6th Anniversary Show but Matsunaga's box office drawing power was considered weak by management and the management had to change their mind.
[3] At 6th Anniversary Show on May 5, 1995, the W*ING team of Matsunaga, Hido and Hideki Hosaka lost to Takashi Ishikawa, Apollo Sagawa and Kishin Kawabata.
On February 23, 1996, Matsunaga, Hido and W*ING Kanemura lost to Masato Tanaka, Ricky Fuji and Tetsuhiro Kuroda in the first-ever WarGames match in FMW history.
Matsunaga lost to longtime rival Mr. Pogo in a Barbed Wire Double Hell Deathmatch on March 15.
Instead Matsunaga and Nagasaki managed to stay away from the tank during the match and built up a decent story and progression for it to take place.
Matsunaga debuted for the new rising deathmatch promotion Big Japan Pro Wrestling (BJW) on July 19, 1996, by teaming with Shoji Nakamaki to defeat Kendo Nagasaki and Seiji Yamakawa in a No Ropes Barbed Wire, Scaffold, Table and Barbed Wire Boards Elimination Deathmatch[41] to begin feuding with Nagasaki.
[43] Daniel Massey of Bleacher Report commented "The piranhas took a chunk out of Matsunaga’s chest and he looked in terrible pain when he left the arena.
Matsunaga was already synonymous with the Death Match format and was considered a veteran, so this new concept of piranhas made it more exciting, as even he hadn’t encountered anything like it before.
[45] On August 23, Matsunaga defeated Pogo in a Glass and Fire Coffin Cremation Deathmatch to win the title.
On December 23, 2009, Matsunaga lost to Akitoshi Saito in his retirement match at a Pro Wrestling NOAH show.