September 13, 1984
|Height||1.84 m (6 ft 0 in)|
|Weight||101.5 kg (224 lb; 15.98 st)|
Sawayashiki, at only 19 years old, turned pro in 2004 and started fighting for R.I.S.E. kickboxing promotion in Japan. He made his K-1 debut on December 2, 2006 at the K-1 WGP 2006 Final undercard, against Mitsugu Noda, winning the fight by split decision.
After three consecutive wins at Yokohama, Hawaii and Amsterdam Sawayashiki earned himself a wildcard entry to the K-1 Final Elimination against the K-1 Asia winner Yusuke Fujimoto. After having his nose broken in the first round, Sawayashiki fought on and knocked down Fujimoto three times in the third round before referee stopped the fight.
His next fight was at the K-1 World GP 2007 Final against 3-Time World Champion, Peter Aerts. He suffered his first K-1 loss by first round Knockout after taking a tremendous right punch to the face. Sawayashiki's career went downhill from there, losing 4 more straight fights in a row, 3 KO losses to Musashi, Catalin Morosanu and Glaube Feitosa plus a punishing three round fight against Jerome Lebanner in the 2008 Final 16. Many now consider Sawayashiki's career short lived and likely over.
- 2006 3rd J-NETWORK Heavyweight champion (May 17, 2006 - June 18, 2007)
|15 Wins (10 (T)KO's, 5 decisions), 8 Losses|
|03/28/2009||Loss||Glaube Feitosa||K-1 World GP 2009 in Yokohama, Yokohama, Japan||KO (Left Straight Punch)||2||0:48|
|09/27/2008||Loss||Jérôme Le Banner||K-1 World GP 2008 Final 16, Seoul, Korea||Decision||3||3:00|
|07/13/2008||Loss||Cătălin Moroșanu||K-1 World GP 2008 in Taipei, Taipei City, Taiwan||KO (Left hook)||1||2:04|
|04/13/2008||Loss||Musashi||K-1 World GP 2008 in Yokohama, Japan||KO (Left straight punch)||2||2:16|
|12/08/2007||Loss||Peter Aerts||K-1 World GP 2007 Final, Japan||KO (Right Cross)||1||1:29|
|09/29/2007||Win||Yusuke Fujimoto||K-1 World GP 2007 Final Elimination, Korea||TKO (Referee stoppage)||2||1:38|
|06/23/2007||Win||Nicolas Vermont||K-1 World GP 2007 in Amsterdam, Netherlands||TKO (Referee stoppage)||2||1:05|
|04/28/2007||Win||Randy Kim||K-1 World Grand Prix 2007 in Hawaii, USA||KO (Punches)||2||2:52|
|03/04/2007||Win||Jérôme Le Banner||K-1 World Grand Prix 2007 in Yokohama, Japan||Unanimous Decision||3||3:00|
|12/02/2006||Win||Mitsugu Noda||K-1 World GP 2006 Final, Japan||Split Decision||3||3:00|
|07/30/2006||Win||Tatsunori Momose||R.I.S.E. XXVIII, Japan||KO||2||2:46|
|05/17/2006||Win||Nobutaka Baba||GO! GO! J-NET '06 ～Invading the DRAGON～, Japan||TKO (Doctor stoppage)||3||0:31|
|03/26/2006||Loss||Yuki||R.I.S.E. G-Bazooka Tournament '06, Japan||KO||1||1:21|
|01/29/2006||Win||Koji Ina||R.I.S.E. XXII, Japan||Unanimous Decision||3||3:00|
|11/27/2005||Win||Yasunari Hasegawa||R.I.S.E. XX, Japan||KO||2||1:26|
|09/21/2005||Win||Takehiro Ikeda||GO! GO! J-NET '05 ～Sky High～, Japan||KO||1||1:47|
|08/28/2005||Win||Atsushi Sato||R.I.S.E. XVIII, Japan||TKO||1||2:27|
|06/19/2005||Loss||Fabiano Aoki||R.I.S.E. G-Bazooka Tournament '05, Japan||Unanimous Decision||3||3:00|
|01/30/2005||Win||Masanobu Yamanaka||R.I.S.E. XII, Japan||KO||3||1:56|
|10/31/2004||Loss||Will Riva||R.I.S.E. X, Japan||Unanimous Decision||3||3:00|
|07/04/2004||Win||Ikeda||R.I.S.E. The Low of The Ring, Japan||Unanimous Decision||2||3:00|
|04/29/2004||Win||Mitsunori Tanimura||R.I.S.E. VII, Japan||Majority Decision||3||3:00|
|02/11/2004||Win||Ray Okamoto||R.I.S.E. VI, Japan||KO||3||1:08|
- Di Pietro, Monty. "K-1 World GP - Press Conference". www.k-1.co.jp. Retrieved 2007-11-30.
- Di Pietro, Monty. "In with the Old and the New at the K-1 Final Elimination". www.k-1.co.jp. Archived from the original on 2007-11-07. Retrieved 2007-11-30.