Kyoma Akimoto Beats Kleber Koike as RIZIN 54 Full Card Results Roll In from Tokyo

On Tuesday, August 11, 2026, RIZIN 54 wrapped at Toyota Arena Tokyo with Kyoma Akimoto taking a unanimous decision over former two-time featherweight champion Kleber Koike Erbst in the main event. The holiday card also settled the Japan Heavyweight Grand Prix semifinals, produced a string of first-round finishes on the undercard, and carried weight-miss penalties for Patchy Mix and Alibek Gadzhammatov into the night.

Editor’s note: This article draws on fight results and card reporting from Sporting News Japan, Cageside Press, RIZIN Fighting Federation, and Sherdog, August 11, 2026.

Main event: Akimoto passes the Koike test

Kyoma Akimoto (13-1) extended his winning streak to six with scores of 29-27, 30-27, and 30-27 against Kleber Koike Erbst (35-10-1) in a 66 kg featherweight headliner billed as grappling royalty versus elite striking.

At 20 years old, Akimoto entered as RIZIN’s fastest-rising featherweight after a shock win over Mix at RIZIN 52. Koike, a two-time former RIZIN featherweight champion, was chasing a rebound on the promotion’s marquee Tuesday card — a rare midweek slot on Japan’s Mountain Day public holiday.

Judges sided with Akimoto’s pace and damage over three five-minute rounds, keeping the Japanese prospect on a collision course with the division’s top names.

Co-main and weight-miss drama

Shoko Sato (39-17-2) edged Patchy Mix (20-5) by unanimous decision (28-27 on all three cards) in the bantamweight co-main — but the story began at the scale.

Mix weighed 2.85 kg over the 61 kg limit, triggering a two-point deduction before the opening bell. Under RIZIN rules, a victory by the overweight fighter would have been recorded as a no contest; Sato’s decision win stands as a normal result.

The former Bellator bantamweight champion had struggled since leaving the UFC, including a loss on his RIZIN debut. Tuesday’s miss added another setback on a card he was expected to headline from the co-main slot.

Alibek Gadzhammatov also missed weight for his flyweight bout with Yuki Ito, facing the same two-point penalty and no-contest condition. It did not matter on the night: Ito stopped Gadzhammatov by second-round KO, keeping a clean official win on the books.

Heavyweight GP semifinals

The RIZIN Japan Heavyweight Grand Prix advanced two finalists at RIZIN 54:

Bout	Winner	Method	Notes
Tsuyoshi Sudario vs. Ryo Sakai	Sudario	R1 KO	GP semifinal
Mikio Ueda vs. King Edokpolo	Edokpolo	R2 KO	GP semifinal

Sudario and Edokpolo will meet in the tournament final at a November 2026 RIZIN event. The winner is slated to face Alexander Soldatkin on the promotion’s New Year’s Eve show for the inaugural RIZIN heavyweight title.

Full RIZIN 54 results

#	Bout	Result	Method
1	Li Kai Wen vs. Arata Mizuno	Li Kai Wen	R1 KO (punches), 4:27
2	Naoki vs. Issa Hosokawa	Naoki	R2 TKO (doctor’s stoppage), 3:09
3	Joe Hiramoto vs. Jolly	Hiramoto	R1 KO (punches), 1:36
4	Joji Goto vs. Azizbek Temirov	Goto	R1 submission (rear-naked choke), 3:41
5	Koji Takeda vs. Kazumasa Majima	Takeda	R1 submission (arm-bar), 4:56
6	Yuki Ito vs. Alibek Gadzhammatov*	Ito	R2 KO
7	Tsuyoshi Sudario vs. Ryo Sakai	Sudario	R1 KO
8	King Edokpolo vs. Mikio Ueda	Edokpolo	R2 KO
9	Shoko Sato vs. Patchy Mix*	Sato	Unanimous decision (28-27 ×3)
10	Kyoma Akimoto vs. Kleber Koike Erbst	Akimoto	Unanimous decision (29-27, 30-27, 30-27)

*Missed weight; two-point deduction applied. A win by the overweight fighter would have been ruled a no contest.

What the card means going forward

Akimoto’s decision over a former champion validates the hype built since his upset of Mix. With the featherweight picture in flux, his next assignment could carry title implications depending on how RIZIN matches the division’s top contenders.

Mix now faces questions about discipline and placement after a second high-profile setback in Japan. Gadzhammatov returns to the flyweight mix with a loss, not a no-contest, but the scale miss will follow him into his next booking.

On the heavyweight side, Sudario — a K-1 crossover with one-punch power — and Edokpolo, who finished Ueda in the second, set up a final that should produce a credible challenger for Soldatkin on NYE.

---

Discussion

Akimoto’s win over Koike and the heavyweight semifinal knockouts gave Japanese fans plenty to debate on a holiday fight night.

1. After beating Mix and now Koike, does Akimoto deserve the next RIZIN featherweight title shot — or does he still need one more test?

2. Patchy Mix missed weight by more than six pounds. How much of his RIZIN arc is fixable, and what should the promotion do with his next booking?

Share your scorecard for the main event and which undercard finish stood out most.