is a Japanese actor, mixed martial artist and professional wrestler known professionally as , who has previously wrestled in All Japan Pro Wrestling (AJPW), New Japan Pro-Wrestling (NJPW), Pro Wrestling Fujiwara Gumi (PWFG), Newborn UWF (UWF), and Wrestle-1 (W-1). He is also the co-founder of Pancrase, one of the first mixed martial arts organizations and non-rehearsed shoot wrestling promotions (following five years after the inception of Shooto but predating America's Ultimate Fighting Championship). Funaki was also Pancrase's biggest star; Josh Barnett described him as the "symbol of Japan", Frank Shamrock labeled Funaki "the golden boy" of Pancrase, and Guy Mezger called Funaki "hands down the smartest and most skilled fighter in Pancrase next to Ken Shamrock".Todd Martin: The overlooked origins of mixed martial arts. Contributor to CBS Sports

Not only the organization's co-founder and most popular fighter, Funaki was also one of Pancrase's most successful fighters to date, scoring submission victories over numerous MMA champions such as Ken Shamrock, Frank Shamrock, Semmy Schilt, Guy Mezger, Yuki Kondo, Minoru Suzuki, and Bas Rutten through the course of his Pancrase career. He is the only fighter in mixed martial arts to hold wins over both Shamrock brothers and Bas Rutten, and was the first man to win the King of Pancrase title twice.

Funaki is widely considered to be one of the greatest Japanese fighters in mixed martial arts history. Sherdog.com ranked him as the #1 mixed martial artist in the world for the years 1996 and 1997, and also had him ranked as a top 4 pound for pound fighter from 1993 to 1998.Sherdog.com Power Ratings, 1993–1998

Early life The son of a movie theater owner, Masaharu Funaki was exposed to martial arts films at an early age. He idolized Bruce Lee above all others, but also eagerly watched the films of Sammo Hung and Sonny Chiba. His father would ultimately abandon young Funaki and his family.

Professional wrestling career New Japan Pro-Wrestling (1985–1989) Instead of entering high school, he applied to New Japan Pro-Wrestling (NJPW), who sent him to the New Japan dojo. He was in the same class as Keiichi Yamada (better known as Jyushin Thunder Liger), Keiji Mutoh, Shinya Hashimoto, Minoru Suzuki, Masahiro Chono, and Chris Benoit. The New Japan Dojo had a reputation for being particularly harsh on its trainees, both mentally and physically, with the intent of only graduating the very best of each class. However, Funaki stunned the New Japan trainers with his athleticism, timing and natural talent for submission grappling. Along with the former Highschool Wrestler Minoru Suzuki, Funaki formed a strong bond with the dojo's head grappling instructor, Yoshiaki Fujiwara. Funaki debuted as a junior heavyweight at the age of 15; a record for the youngest debut in NJPW.

After debuting for New Japan on March 3, 1985, in a losing effort against three-year veteran Tatsutoshi Goto, Funaki did not receive a push from the promotion, stuck in the junior heavyweight division during a time when NJPW owner Antonio Inoki decided to shift the focus of the company towards the heavyweight division. Funaki did, often teaming with fellow wrestler Akira Nogami have many memorable matches with Yoji Anjo and Tatsuo Nakano belonging to UWF and became the first person to take the Shooting Star Press from Yamada. In 1988, he was sent on a learning excursion to Europe, competing in the Catch Wrestling Association (CWA) in Austria and Germany and for All Star Wrestling (ASW) in England in 1989 where "Flying" Funaki and "Fuji" Yamada were a tag team.

When New Japan top draw Akira Maeda became so frustrated with backstage politics that he shoot kicked Riki Choshu and broke his eye socket, and was subsequently suspended for refusing to go on an excursion to Mexico, Maeda left NJPW to form the Newborn UWF promotion. Funaki, seeing an opportunity to shine and showcase his talents, wanted to follow. Maeda negotiated the acquisition of Funaki's contract, along the contracts of friend Minoru Suzuki and mentor Yoshiaki Fujiwara for an undisclosed amount of money.

Newborn UWF and Pro Wrestling Fujiwara Gumi (1989–1993) In Newborn UWF, Funaki became a top draw for the promotion acting as a nemesis to Akira Maeda. When Newborn UWF folded in December 1990, Funaki decided to sign with mentor Fujiwara's new Pro Wrestling Fujiwara Gumi (PWFG) promotion. Funaki left PWFG in 1993 to form the mixed martial arts promotion Pancrase. Around the same time, Funaki was scouted by K-1 executive Kazuyoshi Ishii to compete in their '93 GP tournament, but he declined, having set his sights on MMA.

All Japan Pro Wrestling (2009–2013, 2015–present)

In August 2007, Funaki and Keiji Mutoh discussed the possibility of Funaki returning to regular professional wrestling in Mutoh's company, All Japan Pro Wrestling (AJPW). On August 31, 2009, Funaki signed a one-year contract with All Japan, following a tag team victory with Mutoh against Minoru Suzuki and Masahiro Chono.

On January 3, 2010, Funaki and Mutoh won the World Tag Team Championship from Suzuki and Taiyo Kea. On March 21, Funaki defeated Suzuki in a cage match at All Japan's Sumo Hall show.

On January 4, 2012, Funaki made a special appearance for New Japan at Wrestle Kingdom VI in Tokyo Dome, where he teamed with Masayuki Kono to defeat the Seigigun team of Yuji Nagata and Wataru Inoue. During the match, Nagata broke Funaki's orbital bone, sidelining him from in-ring action for an estimated six months. Funaki returned to the ring on June 17, 2012. On July 29, he defeated the man who had injured him, Yuji Nagata, in a grudge match to become the number one contender to the Triple Crown Heavyweight Championship. On August 26 he defeated Jun Akiyama in a match that lasted less than five minutes to become the 45th Triple Crown Heavyweight Champion. He lost the title to Suwama on March 17, 2013. In June 2013, Funaki announced his resignation from All Japan in the aftermath of Nobuo Shiraishi taking over as the new president and Keiji Mutoh leaving the promotion. Funaki's final match for the promotion took place on June 30 and saw him and his Stack of Arms partners Koji Kanemoto and Masayuki Kono, who were also leaving All Japan, lose to Akebono, Osamu Nishimura and Ryota Hama in a six-man tag team match.

After becoming a freelancer, Funaki returned to All Japan on November 11, 2015, teaming with Kendo Ka Shin to defeat Suwama and Hikaru Sato. Funaki periodically shows up in All Japan for tag team matches but has not expressed a will to contend for titles again.

Wrestle-1 (2013–2015) On July 10, 2013, Funaki was announced as part of Keiji Mutoh's new Wrestle-1 (W-1) promotion. During the promotion's inaugural event on September 8, Funaki teamed with Masayuki Kono in a tag team match, where they were defeated by Katsuyori Shibata and Kazushi Sakuraba. Following the match, Kono turned on Funaki, hitting his mentor with a steel chair. Funaki and Kono faced off in a singles match at Wrestle 1's second show on September 15, where Kono was victorious with help from Kazma Sakamoto and Ryoji Sai. A rematch between the two took place on October 12 and saw Funaki emerge victorious. On March 2 at Kaisen: Outbreak, Funaki defeated Total Nonstop Action Wrestling (TNA) representative Bobby Roode in an interpromotional match, after which he challenged Olympic gold medalist Kurt Angle to a match. At Wrestle-1's July 6 event, Funaki defeated Pro Wrestling Zero1 (Zero1) representative Kohei Sato to win the World Heavyweight Championship. He lost the title back to Sato on September 19. Three days later, Funaki entered the Wrestle-1 Championship tournament, defeating Tajiri in his first round match. The following day, Funaki defeated Akira to advance to the semifinals of the tournament. Prior to the semifinals of the tournament, Funaki entered a storyline, where his former rival Tajiri came to his aid to help him prepare for his match. On October 8, Funaki was eliminated from the tournament in the semifinals by Masayuki Kono, after Tajiri turned on him. In June 2015, it was announced that Funaki would be leaving Wrestle-1 and going freelance following his contract expiring at the end of the month. His final match for the promotion took place on June 20.

Freelancing (2015–present) Funaki wrestled his first match as a freelancer on August 18, 2015, at a Masahito Kakihara cancer benefit show, where he and Minoru Suzuki defeated Mitsuya Nagai and Takaku Fuke. On September 18, Funaki won his first title since becoming a freelancer, when he defeated Real Japan Pro Wrestling (RJPW) wrestler Super Tiger to win the Legend Championship. He lost the title to Daisuke Sekimoto on December 9, before regaining it on June 23, 2016. On September 10, Funaki lost the Legend Championship to Shinjiro Otani. On January 9, 2017, Funaki and Yukio Sakaguchi defeated Konosuke Takeshita and Mike Bailey at a DDT Pro-Wrestling (DDT) event to win the promotion's KO-D Tag Team Championship. They lost the titles to Danshoku Dino and Yoshihiro Takayama in their third defense on April 29. Funaki Wrestled at NOAH – DESTINATION 2021 BACK TO BUDOKAN! on 2/12/21 in a losing effort versus Kenoh for the GHC National Title.

Mixed martial arts career Overview Funaki's MMA career began when he founded Pancrase along with Minoru Suzuki. Funaki went on to defeat Bas Rutten, Ken Shamrock, Frank Shamrock, Minoru Suzuki, and Guy Mezger, among others. Frank Shamrock said, "Funaki was like a mad scientist. He took the idea of submissions to an even higher level than the rest of the Japanese contingent. He had this insatiable desire to learn more and push his body harder. And as an entertainer he understood the need to entertain."

This realization for the need to entertain often resulted in Funaki (along with Minoru Suzuki) "carrying" some of their opponents during fights. In essence, in order to entertain the crowd, Funaki and Suzuki would occasionally give their opponents opportunities to create drama before finally finishing them off. Josh Barnett said, "when you're that good, you can have a guy thinking he's doing so much better than he expected and have no idea that they're just letting you last like a cat playing with a mouse." Frank Shamrock added, "I know for a fact those guys (Funaki and Suzuki) were light years ahead of everyone else, and they were so good that they would go towards entertainment before they finished a match." However, this did backfire on Funaki on at least one occasion. In a match against Jason DeLucia, Funaki allowed Delucia to catch him in a kneebar in order to create drama and planned on using a rope escape once Delucia had the submission locked in. Unfortunately, Funaki mistakenly allowed himself to get too far from the ropes and was forced to tap out.

Pancrase (1993–1999) Funaki debuted in the main event of Pancrase's first show, taking on apprentice and training partner Ken Shamrock. Although Funaki led the pace of the match earlier with strikes, Shamrock captured his back, took him down and eventually submitted him with an arm triangle choke, winning the fight. The victory elevated Shamrock to star status and launched the MMA career of both men. Masakatsu got his first victory at the next event, showing his submission skills by catching Ryushi Yanagisawa first in a heel hook and later in a kneebar in under two minutes for the victory. He would then face Dutch fighter Cees Bezems, who threw illegal closed-fisted punches during the match. In response, Funaki executed a takedown and submitted him with a top wrist lock; after the tap out, Funaki again locked in the hold as revenge, and had to be restrained by the referee. Funaki closed the first four Pancrase events with a win against Kazuo "Yoshiki" Takahashi, overwhelming him with palm strikes and knees to the face for the KO.