Riku Morisaka

Morisaka made his professional debut against Takumi at Syuken 27 on October 25, 2015. He won the fight by unanimous decision and amassed a 4–3–1 record over the next two years, before being placed in the KHAOS super bantamweight tournament, which was scheduled to take place at KHAOS 2 on July 8, 2017.[2] Although Morisaka was able to overcome the future Krush and K-1 featherweight champion Yuki Egawa by split decision in the semifinals of the one-day tournament,[3] he lost the final bout against Shota Oiwa by unanimous decision.[4] It was his second career loss at the hands of Oiwa, as he had previously beaten him by unanimous decision at Syuken 30 on February 11, 2016.[5]

On May 26, 2018, Morisaka faced another future K-1 featherweight champion in Tatsuya Tsubakihara at KHAOS 5.[6] He lost the fight by unanimous decision.[7] Four mnoths later, at Krush 93 on September 30, 2018, Morisaka was booked to face Taito Gunji in the quarterfinals of the Krush Super Bantamweight tournament.[8] He lost the fight by majority decision, with two of the judges scoring the fight 30-28 for Gunji, while the third judge scored it 30-30.[9]

Morisaka took part in the one-day Krush featherweight tournament, held to fill the vacant throne, at Krush 119 on November 27, 2019. He faced Keito Okajima in the semifinals and won the fight by a third-round technical knockout, knocking Okajima down twice by the 2:58 minute mark of the round. In the tournament final Morisaka faced Takahito Niimi. The fight was ruled a draw after the first three rounds were fought, with two of the judges scoring the bout as a draw (29-29 and 30-30), while the third judge scored it 30–29 in Niimi's favor. Accordingly, an extension rounds was fought, after which Niimi won a unanimous decision.[10][11]

Morisaka was scheduled to rematch Taito Gunji at K-1: K'Festa 4 Day 1 on March 21, 2021.[12] He lost the fight by unanimous decision, with scores of 30–27, 30-26 and 30–26.[13]

Morisaka faced Toma Tanabe at K-1 World GP 2021 in Osaka on December 4, 2021. He lost the fight by unanimous decision.[14]

Morisaka faced Haruma Saikyo at K-1 World GP 2022 Yokohamatsuri on September 11, 2022, in what was Saikyo's return to professional competition following a close to three-year absence from the sport.[15] He won the fight by split decision, after an extra fourth round was contested.[16]

Morisaka faced the once-defeated Rei Inagaki at Krush 144 on December 18, 2022. He won the fight by unanimous decision, with all three judges awarding him a 30–29 scorecard.[17]

Morisaka challenged Shuhei Kumura for his Krush Featherweight (-57.5kg) title at Krush 147 on March 25, 2023.[18] He won the fight by unanimous decision, with two scorecards of 30–28 and one scorecard of 29–28. Morisaka knocked his opponent down with a spinning backfist in the opening round of the contest.[19]

Morisaka faced the former K-1 featherweight champion Tatsuya Tsubakihara at K-1 World GP 2023 in Yokohama on June 3, 2023.[20] He lost the fight by unanimous decision, with two scorecards of 30–28 and one scorecard of 30–29.[21]

Morisaka made his first Krush Featherweight title defense against Tatsuki Shinotsuka at Krush 154 on October 21, 2023.[22] He lost the fight by majority decision, with scores of 30–29, 30–29 and 29–29.[23]