Manny Diaz Faces One Duke Question That Could Derail 2026

As Duke's quarterback situation unfolds, Manny Diaz faces the urgent challenge of addressing defensive vulnerabilities masked by last season's offensive success.

Duke’s biggest problem heading into 2026 sits right under center, and the numbers make that hard to ignore.

Walker Eget gives Manny Diaz a veteran option, but he also represents a clear step down from Darian Mensah. Even if Eget turns in the best season of his career after arriving from San Jose State, the Blue Devils would still be looking at less than what Mensah likely would have delivered in Durham. That gap matters because Mensah’s play last season helped mask a few issues elsewhere on the roster, especially on defense.

Diaz has built his reputation on that side of the ball, but Duke still finished No. 86 in defensive SP+ last season. The Blue Devils were able to survive it anyway, winning nine games and claiming their first outright ACC Championship since 1962, largely because the offense was strong enough to carry the load. Duke’s offense ranked 19th in SP+.

The challenge now is whether the rest of the roster can do enough to keep the quarterback from having to do too much. The running game should still have juice with rising sophomore Nate Sheppard, and the offensive line is expected to be a strength. Even so, if Eget is merely solid instead of special, Duke may not have much margin for error.

That concern showed up clearly in Sports Illustrated’s recent ranking of all 68 Power Four quarterbacks for 2026. Mensah landed fifth. Eget came in at 59th.

This was supposed to be a much different conversation. Mensah originally signed a two-year deal through the Transfer Portal, and there was little reason to think he wouldn’t be back in Durham for a second season. Instead, he entered the portal at the 11th hour and headed to Miami, leaving Duke scrambling late.

Diaz did what he could in response, bringing in Eget as a seasoned quarterback with plenty of starting experience. But the reality never changed: that move was a downgrade.

Eget is the projected starter, though the job is not locked up. Sophomore Dan Mahan is still in the mix, and the coaching staff is high on him. The two will compete this fall, but the expectation is that Eget’s experience will give him the edge.

No matter who wins the job, Duke will need better play across the board to support the quarterback. Neither Eget nor Mahan is likely to raise the ceiling the way Mensah did. That leaves Diaz with the same assignment he’s facing everywhere else on the roster: find a way to lift the whole team, or risk watching Duke slide backward in 2026.

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