Ultimate Fighting Championship Yamamiya signed with the
UFC in 1999. He made his debut against
Eugene Jackson at
UFC 23 on November 19, 1999, and lost via first-round knockout. Yamamiya was then granted his release to return to
Pancrase.
Pancrase Yamamiya's history with Pancrase goes back his professional debut in 1996, when he faced Satoshi Hasegawa at the 1996 Pancrase Neo-Blood Tournament. He won his debut by split decision. He then lost in the quarter-finals of the tournament, falling to now-MMA legend
Yuki Kondo by TKO. He faced
Ryo Kawamura to become the
Light Heavyweight King Of Pancrase at
Pancrase: Shining 8 on October 1, 2008. He lost via unanimous decision. On June 5, 2010, Yamamiya challenged Kengo Ura to become the
Welterweight King Of Pancrase at
Pancrase: Passion Tour 5. He lost the fight via split decision. Yamamiya faced Yuji Hisamatsu at Pancrase 250 on July 28, 2013. Though Yamamiya was the heavy favorite on multiple media scoring websites, Hisamatsu won a majority decision.
DEEP Yamamiya made his
DEEP debut on January 8, 2001, when he faced
Paulo Filho at
DEEP: 1st Impact. He lost via second-round TKO. He faced Yuki Okano at DEEP: 65 Impact on March 22, 2014. Yamamiya was quickly taken down and submitted with a
rear naked choke in the first round. Yamamiya faced UFC veteran
Keita Nakamura at DEEP: 67 Impact on June 22, 2014. He lost the fight via TKO (punches) in the first round, putting Yamamiya at four losses in a row.
Sengoku Though not currently active for the promotion, Yamamiya signed a contract with
Sengoku and made his debut against
Alexandre Ribeiro at
Sengoku 8 on May 2, 2009. He lost via third-round knockout. ==Championships and accomplishments==