[8] Saruta made his professional MMA debut on January 26, 2008 at Shooto: Back to Our Roots 7 against Kota Funaki.
[9] On August 9, 2009, Saruta got his first professional victory over Takahiro Kohori at Shooto: Gig Saitama 1 by first-round TKO.
During this run, he won the Shooto Infinity Bantamweight tournament, with a majority decision win over Masumi Tozawa.
[12] After early failed attempts at winning Shooto titles, Saruta moved to Tokyo and changed camps to begin training with Wajutsu Keishukai Hearts.
After an up-and-down stretch that saw Saruta go 3-4-1, the Japanese fighter began another five-match unbeaten streak that would lead to a flyweight title shot against Ryuto Sawada.
On October 15, 2017, Saruta defeated Sawada by knockout in the fourth round to capture the Shooto flyweight championship.
[17] At ONE Century, Saruta bounced back with a KO victory over the Pancrase strawweight champion Daichi Kitakata, stopping his opponent in the first minute of the second round.