The Diamondbacks Are One Bad Week Away From Watching October From Home

Paul Sewald's designated-for-assignment was called a "brutal decision" by the organization, and credit them for the honesty. It was brutal. But here is the harder truth: it was also the right call, and the fact that it had to be made at all tells you everything about where this franchise stands on August 11th. Your closer—24 saves to his name this season—was posting a 6.23 ERA. You cannot close games with that. You also cannot win a pennant race without a closer. So Arizona enters the final 64 games of 2026 holding the last wild-card spot by exactly zero games, having just surgically removed its own ninth inning.

I wrote ten days ago that Arizona bet the deadline on runs and the rotation called that bluff. The rotation is still calling it. Over the last ten games, the pitching staff has surrendered 4.3 runs per contest—nearly a full run worse than the prior twenty-game stretch. That is not a slump. That is a structural collapse arriving on schedule. Corbin Burnes is on the 60-day IL. Zac Gallen, who has been a disaster all season at 3-9 with a 6.40 ERA, is also on the 60-day IL. Ryne Nelson, Andrew Saalfrank, and a half-dozen others are unavailable. Eduardo Rodriguez at 11-4 with a 2.70 ERA remains the one genuine ace on this staff, a horse carrying weight that would buckle most rotations. Brandon Pfaadt and Michael Soroka—who returned from the IL Monday—provide real secondary depth, but this is a three-man rotation pretending to be five, and the math is unforgiving over 64 games.

Then Geraldo Perdomo's knee gave out Monday night in the fourth inning against Colorado. Jordan Lawlar is already on the 10-day IL. The shortstop position, which has been one of Arizona's quiet strengths through Ildemaro Vargas's steady .325 average and 43 RBI, is now being held together with tape and optimism. Losing Perdomo—even temporarily—compounds a depth problem that was already visible before the first pitch of August.

The historical parallel that keeps coming to mind is the 2007 Mets, a team that held a substantial division lead in September and watched it dissolve not through one catastrophic collapse but through the slow accumulation of exactly this kind of damage: a bullpen that couldn't hold games, a rotation that wore thin, an offense that couldn't compensate for all of it simultaneously. Arizona is not in that position yet—they have not squandered a lead so much as they have failed to build one—but the architecture of the problem rhymes. Teams that tread water at the margins, allowing slightly more runs each week while their offense normalizes, tend not to find a second gear. They find elimination.

The signing of Zack Littell is a reasonable move. Michael Soroka back in the rotation is genuinely useful. But my read is this: the Diamondbacks needed a different kind of August than the one they are getting. The July surge—that six-game winning streak, that stretch where they were outscoring opponents by nearly two runs a game—was the version of this team that could make a run. That version has not shown up in August. What has shown up instead is a 5-5 team with a gutted bullpen, a compromised shortstop situation, and a rotation allowing runs at a pace that will not survive contact with the Padres or the Dodgers or anyone else chasing October.

Here is the declaration: Arizona makes the postseason only if Eduardo Rodriguez pitches like a Cy Young candidate the rest of the way and at least one of Pfaadt or Soroka holds their form without interruption. Any further injury to the rotation—one more name on the 60-day IL—and this team slides out of the wild card before Labor Day. The margin is not thin. The margin is gone.