Yokohama High School Falls 7-1 as Chiben Wakayama Reaches 108th Summer Koshien Final

On Thursday, August 20, 2026, Chiben Wakayama routed Yokohama High School 7-1 in the first semifinal of the 108th Summer Koshien at Hanshin Koshien Stadium in Nishinomiya, Hyogo. The Wakayama side scored four runs in the third inning — capped by Ryusei Kusumoto’s three-run homer off ace Shoki Oda — to overturn an early deficit and advance to Saturday’s championship game for the first time since winning the 2021 summer title.

Editor’s note: This article draws on match reports from TBS NEWS DIG (JNN), Mainichi Shimbun, Nikkan Sports, and tournament data from the Japan High School Baseball Federation and Hanshin Koshien Stadium, August 20, 2026.

Match at a glance

Detail	Information
Tournament	108th National High School Baseball Championship (Summer Koshien)
Round	Semifinal — Game 1, Day 14
Date	Thursday, August 20, 2026
Venue	Hanshin Koshien Stadium, Nishinomiya, Hyogo
Final score	Chiben Wakayama 7, Yokohama High School 1
Winning pitcher	Kota Waki (Chiben Wakayama) — 8 innings
Losing pitcher	Shoki Oda (Yokohama) — pulled mid-3rd
Chiben hits	14

Score by inning

Yokohama scored in the top of the 1st. Chiben Wakayama tied the game and took the lead with a four-run 3rd inning, then added three runs in the 7th to seal the result. Yokohama did not score after the opening frame.

How Chiben Wakayama won

Yokohama strikes first against Waki

Chiben Wakayama sent ace right-hander Kota Waki (3rd year) to the mound — his third start of the tournament. In the top of the 1st, a hit and Chiben’s first error of the tournament put runners on first and second with one out. Yokohama cleanup hitter Kei Kawagami (2nd year) delivered an RBI single to center, giving the Kanagawa side a 1-0 lead.

Chiben’s powerful lineup, which had piled up 18 hits and 11 runs against Sendai Ikuei in the quarterfinals, could not solve Oda early. In the 1st, consecutive hits from Yota Imoto and catcher Rinto Yamada with two outs went unrewarded when Kusumoto grounded out. In the 2nd, a walk and an infield hit loaded the corners with one out, but a failed safety squeeze ended the threat.

The third-inning turning point

Waki escaped a one-out, third-base jam in the top of the 3rd with back-to-back strikeouts. Chiben’s answer came immediately in the bottom half.

Leadoff hitter Yusei Arai (3rd year) reached on a hard-hit infield single. Imoto followed with a left-field single, and Yamada ripped a two-run double down the third-base line to tie the game at 1-1. With runners on second and third and nobody out, Kusumoto attacked a 0-2 fastball from Oda — clocked at 154 km/h (~96 mph) — and drove it into the right-field stands for a three-run homer, the tournament’s seventh home run. The blast gave Chiben a 4-1 lead and knocked Oda from the game after Kazushiro Kawahara reached on another infield hit.

Yokohama turned to left-hander Tetsuzaburo Kobayashi (2nd year) in relief but could not limit further damage in the inning.

Waki shuts the door; offense adds insurance

From the 4th through the 8th, Waki controlled Yokohama’s lineup. He needed only eight pitches for a three-up, three-down 4th inning, retired the top of the order in the 5th, and set down Kawagami on three straight fly balls to right in the 6th. In the 7th he allowed a leadoff double but induced a game-ending double play.

Chiben’s offense broke the game open in the bottom of the 7th. Arai and Imoto opened with consecutive hits. After Yamada struck out, Kusumoto singled home a run to make it 5-1. Pinch hitter Hinata Idomoto then lined a two-run single to right, pushing the margin to 7-1.

Pitching lines

Pitcher	Line
Kota Waki (Chiben)	8 IP, 4 H, 1 ER, 1 BB, 6 K, 101 pitches
Ryota Hisaba (Chiben)	1 IP, 1 H, 0 R (9th inning)
Shoki Oda (Yokohama)	2⅔ IP, 6 H, 4 ER (pulled mid-3rd)
Tetsuzaburo Kobayashi (Yokohama)	Relief from 3rd

Waki has now thrown 11 innings across three tournament appearances, allowing just one run on five hits.

Kusumoto’s data-driven swing

Kusumoto entered the semifinal with modest personal numbers through the early rounds, but his third-inning at-bat became the game’s defining moment. After seeing Oda’s pitches clearly in his first plate appearance, he said he approached the 0-2 count with a clear plan to drive the ball.

Chiben Wakayama’s support staff had tracked Oda’s tendencies: on no-strike, two-ball counts, the data showed he threw a fastball 100 percent of the time. Kusumoto committed to swinging at the straight ball — and connected for what he called his “most perfect” home run at Koshien.

The team had also prepared for Oda’s velocity by facing a 174 km/h (~108 mph) pitching machine in practice the day before. Kusumoto said Oda’s fastball looked the same as what they had trained against: “That’s why I could hit it.”

After the game, Kusumoto credited teammates who carried earlier rounds: “I was the hero today, but in other games other players stepped up. That’s why we got this result.”

Stakes for both programs

Yokohama High School

Yokohama entered the semifinal as the consensus No. 1 team in pre-tournament previews and the 2026 Spring Koshien champion. The program was chasing its first summer national title since 1998 — a 28-year gap — and a rare spring-summer double championship.

Oda, a right-hander who touched 156–157 km/h at Koshien and set the tournament’s all-time velocity record, had dominated through the quarterfinals, including a 10-strikeout shutout against Hanamaki Higashi. His early exit on semifinal day ended Yokohama’s title run at one win short of the summer final.

The two schools had met before on the biggest stage: Yokohama defeated Chiben Wakayama 11-4 in the 2026 Spring Koshien final in March to claim a fourth spring championship.

Chiben Wakayama

Chiben Wakayama, a four-time national champion in combined spring and summer play, is seeking its third summer title and first since 2021. Manager Jin Nakaya had signaled a bullpen-by-committee approach before the game, trusting Waki to set the tone while keeping other arms ready. The plan worked: Waki went deep, and Hisaba closed without drama.

The Wakayama program now awaits the winner of the second semifinal between Tenri and Kantō Gakuin Daigaku Takasaki, played later on August 20. Saturday’s final is scheduled for 10:00 a.m. at Hanshin Koshien.

What the result means

Team	Outcome
Chiben Wakayama	First summer final since 2021; one win from a third summer crown
Yokohama High School	Eliminated; spring title stands, but summer repeat bid ends in the semifinals
Shoki Oda	Tournament ends with a rare rough outing against a lineup built to pressure elite pitching
Kota Waki	Strengthens his case as the staff ace who can pitch deep in elimination games

For Yokohama High School fans and alumni, the 7-1 loss closes a summer run that had restored the program to national prominence. For Chiben Wakayama, the rematch reversal sets up a shot at redemption on the same dirt where they fell to Yokohama in the spring final five months earlier.

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Discussion

A single third-inning sequence — three straight hits, a tying double, and a three-run homer off Japan’s most feared high school arm — decided who would play for the crimson flag on Saturday.

1. Kusumoto swung at an 0-2 fastball from a pitcher touching 157 km/h because team data said Oda would throw a strike. Does analytics belong at Koshien, or does it break the romance of high school baseball?

Where is the line between preparation and over-coaching on amateur baseball’s biggest stage?

2. Yokohama pulled Oda after 2⅔ innings in a game they trailed by three. Was leaving him in for one more batter the right call, or should a spring champion protect its ace differently in a single-elimination semifinal?

How much of this loss is pitching management versus Chiben’s lineup simply solving the country’s best high school pitcher?

3. Chiben Wakayama lost the 2026 Spring Koshien final to this same Yokohama team 11-4. Does a 7-1 summer semifinal win flip the rivalry, or is one game still just one game before Saturday’s final?

Who do you favor in the championship — Chiben Wakayama, Tenri, or Kantō Gakuin Takasaki?

Share your read on whether Kusumoto’s homer will be remembered as the swing of the 108th Summer Koshien.

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For official brackets and results, see the Japan High School Baseball Federation and Hanshin Koshien.