Ozawa made his professional debut in June 2014, at Krush 42, against Kento Ito. The fight ended in a draw.[2] Ozawa then won his next six fights, including a rematch with Kento Ito, before suffering the first professional loss of his career, dropping a majority decision against Hirotaka Asahisa.[3] In his next fight, at Krush 61, Ozawa fought Kento Ito for the third time, with the fight ending in a draw.[4]
Krush title reign
At Krush 63, Ozawa fought Shota Kanbe for the Krush Featherweight title. He beat Kanbe by majority decision.[5] Ozawa then fought the K-1 Super Bantamweight champion Takeru Segawa in February 2016. During the pre-fight stare down, the two fighters came to blows, and had to be separated by the security.[6] Takeru won the fight by unanimous decision.[7] Kaito then returned to Krush, to defend his title against Tatsuya Oiwa at Krush 68. The fight went into an extra round, after which Ozawa won by decision.[8]
Ozawa took part in the 2016 K-1 Featherweight GP. He knocked out Josh Tonna in the quarterfinal, and defeated Elias Mahmoudi by unanimous decision in the semifinal, but lost to Takeru Segawa by unanimous decision in the final bout.[9]
He successfully defended the Krush title for the second time against Yun Qi, winning by majority decision.[10] Ozawa would then suffer back-to-back losses to Haruma Saikyo, losing both times by unanimous decision. In their second fight, Ozawa lost the Krush title as well.[11]
During K-1 World GP 2019: K’FESTA 2, Ozawa won a unanimous decision against Hayato. Three months later, he won another unanimous decision, against Takahiro. He was then scheduled to fight Jawsuayai Sor.Dechaphan at K-1: K’Festa 3.[15] Jawasuayai won by TKO, after the ringside doctor stopped the fight at the end of the second round.[16] He lost his next fight to Tatsuki Shinotsuka at K-1: K'Festa 4 Day 1 as well, dropping a split decision.[17]
Ozawa was scheduled to face Shuhei Kumura at K-1 World GP 2022 Japan on February 27, 2022.[20] He lost the fight by unanimous decision, with all three judges scoring the bout 30–29 for Kumura.[21]
Ozawa was expected to face Tatsuya Oiwa at K-1 World GP 2023: K'Festa 6 on March 12, 2023.[22] Ozawa withdrew from the fight on March 8, due to a bone contusion of a metacarpal bone, and was replaced by Yuta Kuneida.[23]