After training at the FMW Dojo, Sasaki made his debut in December 1997 under his given name and competed as an enhancement talent through the early years of his career.

[8] At Atsushi Onita Presents Liar, Liar, Sasaki competed in the first main event of his career by teaming with Atsushi Onita, Pogo #2 and Arai against Fuyuki, Yukihiro Kanemura, Koji Nakagawa and Go Ito in a weapon deathmatch in a winning effort to retain Arai's presidency and release Tetsuhiro Kuroda and Hideki Hosaka from TNR's slavery.

[13] On September 24, Sasaki participated in his first pay-per-view main event by teaming with H, Tetsuhiro Kuroda and Flying Kid Ichihara to defeat "Hayabusa", Koji Nakagawa, Gedo and Chocoball Mukai.

[18] At Night in Shibuya Backdraft Eve, Sasaki won the first title of his career as he and Hosaka defeated Kintaro Kanemura and Hido to become the inaugural WEW Hardcore Tag Team Champions.

[28] On September 21, Sasaki and Hosaka lost the Hardcore Tag Team Championship to Jado and Gedo in a three-way match, also involving Kintaro Kanemura and Ryuji Yamakawa.

[29] At Deep Throat, Sasaki and Hosaka defeated Xtreme Pro Wrestling's Supreme and Homeless Jimmy to win their third Hardcore Tag Team Championship.

[37] On June 8, Kodo Fuyuki announced that he was going to sell FMW to Stuart Levy's Tokyopop as he owned the majority of the shares and offered the wrestlers to leave Shoichi Arai and side with him.

[38] Sasaki began rising as a main event competitor and defeated Onryo on July 20,[39] to earn his very first opportunity for the WEW World Heavyweight Championship against Hayabusa on the August 1 airing on Samurai!

[40] On August 11, Sasaki and Chocoball Mukai unsuccessfully challenged GOEMON and Onryo in an octagon cage match for the WEW Tag Team Championship.

[45] Later that night, the duo vacated the title to feud with Kodo Fuyuki, who had joined forces with Genichiro Tenryu's WAR group.

On December 9, Gannosuke, Sasaki, Kanemura and Kuroda defeated the WAR team of Tenryu, Fuyuki, Arashi and Koki Kitahara to gain revenge for FMW.

[48] At FMW's last show on February 4, Sasaki teamed with GOEMON and Kintaro Kanemura to beat Grimes, Paul DeLuc and Mitsunobu Kikuzawa.

[55] Sasaki suffered an injury and returned to WMF at Marvelous Days on December 12 by wrestling Tetsuhiro Kuroda to a double count-out.

[56] Sasaki was pushed as the promotion's top fan favorite, feuding with the Brand Double Cross group and was eventually groomed to become the company's ace.

[57] On July 25, Sasaki teamed with Tetsuhiro Kuroda and Kintaro Kanemura to defeat Gannosuke, Mr. Iwaonosuke and Mr. Rocknosuke in a street fight by debuting his new finishing move, 29 Years Old to prevent WMF from ending.

[64] At WMF's 2nd Anniversary Show, Sasaki teamed with Seiya Morohashi and Tomohiko Hashimoto to defeat GOEMON, Junji Tanaka and Onryo.

[66] Sasaki began appearing at Apache Army shows in early 2005 to distance himself from WMF as he was irate at Gannosuke booking himself as the focus of the promotion.

[84] On July 13, Sasaki and Daisuke Sekimoto defeated Kengo Mashimo and Madoka to win his second BJW Tag Team Championship.

[89] On October 27, Sasaki and Kamui defeated Kengo Mashimo and Ryuichi Sekine to win the WEW Hardcore Tag Team Championship.

[94] On January 15, 2013 airing of Samurai TV!, the team of Hiroki, Sasaki, Ryuchi Sekine and The Winger defeated Badboy Hido, Kenji Fukimoto, One Man Kru and Captain Abnormal in a scramble bunkhouse deathmatch.

[95] Sasaki participated in a tournament for the inaugural King of Freedom World Championship, losing to Minoru Fujita in the opening round on February 27.

[97] In January 2014, Sasaki was paired with Toru Suguira to participate in a tournament for the inaugural King of Freedom World Tag Team Championship.

On January 3, the duo challenged Jun Kasai and Masashi Takeda, Brahman Brothers, Takashi Sasaki and Tatsuhito Takaiwa and Kenichiro Arai and The Winger in a five-way match.

[101] They successfully defended the title against fellow FMW alumni Mr. Gannosuke and Gosaku Goshogawara to celebrate Kamui's tenth anniversary of his career on May 17.

[105] On March 23, Sasaki and Suguira defeat Brahman Brothers to win the King of Freedom World Tag Team Championship.