[Aug 9, 2026 (Sun)] NPB Japanese Baseball Analysis Eagles vs Fighters Preview - BeaverStats

This is an NPB analysis post written by AI.

Quick preview of Eagles vs Fighters (Aug 9, 2026 (Sun)).

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You can see the full, more detailed data on the game list.

This post was analyzed/written by AI based on data from beaverstats.com. Treat it as a reference only - always verify the numbers yourself before acting on them.

Eagles vs Fighters (08/09 14:00, Es Con Field)

Starters: Eagles Koja Tatsuki / Fighters Arihara Kohei

The Fighters hold a clear edge in the standings, sitting third at 55.8% against the Eagles' sixth-place 39.2%, and they've also won this season's head-to-head series 11-7 (61%). Recent form, though, is close - both teams sit around .500 over their last five games (Eagles 3-2, Fighters 2-3).

On stuff, Koja's velocity spiked as high as nearly 148 km/h before settling back down to 143.8 most recently, while Arihara has climbed steadily from 143.6 up into the 146-147 range and held there. The win-loss records look rough for both starters - Koja is 1-7 and Arihara is 3-6 - but the ERAs (4.07 and 4.88 respectively) tell a less extreme story than the records alone suggest.

There's a real reversal in recent form: Koja's last-five-start FIP sits at 2.31, a big improvement over his 3.49 season mark, with 24 innings backing that up as a real sample rather than noise. Despite the 1-7 record, his stuff has clearly picked up lately. Arihara has also improved modestly, with a 3.33 last-five FIP against a 3.65 season mark. Koja has a decent history against the Fighters overall - a 2.4 ERA over 15 innings - and in his last two head-to-head starts (L on 4/22, 6.0 IP, 3 ER; L on 4/8, 9.0 IP, 1 ER) he was saddled with a loss on 4/8 despite what was essentially a complete-game-caliber outing, another sign of thin run support. Arihara has no recorded prior starts against the Eagles.

Both lineups remain unconfirmed, carried over from the previous game. Fighters hitters with a track record against Koja have mostly struggled - Mizuno is hitless in 2 at-bats and Narama hitless in 3, while Reyes stands out at 2-for-6 (.333). On team hitting form, the Fighters have cooled noticeably, dropping from a season .350 wOBA to .302 over the last five games, while the Eagles have stayed roughly flat at .319 to .313 - so the home lineup's punch has faded a bit lately.

The bullpens show a real gap: the Eagles' relief corps has struggled recently at 6.00 ERA over 6.1 innings across six arms, while the Fighters' pen has been much steadier at 2.86 ERA over 7.2 innings across five arms. Es Con Field is a retractable-roof stadium, so weather shouldn't be a major factor.

In summary, the standings, head-to-head record, and bullpen all lean toward the Fighters, but both starters' recent underlying numbers and the cooling Fighters lineup mean Koja's 1-7 record shouldn't be taken at face value here.