Ohio State won 42-19, but its defense still got embarrassed in ways the scoreboard could not hide. Illinois piled up 462 yards, including 199 on the ground, and repeatedly ripped off explosive plays against a unit that had looked far more disciplined through the opening weeks. For Ryan Day, this was less a comfortable win and more a warning shot.

me of the breakdowns that happened. And got to get them fixed, too many mistakes, guys owned it. And so, got out there on Sunday, made a bunch of the corrections. So we got to get back here tomorrow, get on the field and do a better job there because it starts there.”

Before Illinois, Ohio State had allowed only 257 rushing yards through its first three games. Bret Bielema’s team nearly matched that number themselves, averaging six yards per carry on 33 attempts. The Illini repeatedly generated explosive plays, a jarring change from what had been a remarkably stingy defense through the opening weeks.

Ohio State did at least make the stops that mattered. Jaylen McClain was one of the biggest reasons why. Late in the fourth quarter, he recognized where Houser was looking on a fourth-down attempt, broke toward the route and disrupted the pass near the goal line. Illinois came away empty, and the Buckeyes protected their two-touchdown cushion. That’s why Ryan Day singled him out.

“Jaylen McClain really made some huge plays for us,” he said. “That was big. He made the one to finish the game and then a couple down there in the red zone. We really needed those in that moment.”

Those moments kept a bad defensive afternoon from becoming a much bigger problem. Ryan Day also pointed out that once a team builds a lead, opponents are more willing to treat every fourth down as an opportunity, effectively forcing a defense to win two downs instead of one. But that does not erase the warning signs.

“Coaches have to own some things,” he added. “Players have to own some things. And that’s how you get things fixed.”

Ohio State is replacing an extraordinary amount of defensive production, including three players who became top-11 NFL draft picks. The new group has shown flashes, but Illinois exposed some seams that cannot remain open.

Kenyatta Jackson Jr. has already framed the 199 rushing yards as 200 in the mind of the defensive line. The last time Ohio State surrendered at least 200 rushing yards was the 2023 Cotton Bowl against Missouri. And the problems were not limited to the front.

Ryan Day needs to fix a lot on Ohio State defense

On the 97.1 The Fan Snap Judgments discussion, Jeremy Birmingham pointed out that Illinois also threw for 263 yards and that the secondary had its own issues to answer for. Austin Ward added another layer, saying the problems appeared tied to communication and assignments in the back end as well as breakdowns up front. Illinois finished with 462 total yards, including 263 through the air.

That said, there was nowhere for the defense to hide. Ryan Day acknowledged as much. He said the issue was not simply missed tackles. Instead, players were failing to execute their responsibilities, creating the kind of openings that good offenses eventually punish.

The Buckeyes finished with three sacks against Katin Houser, who completed 21 of 37 passes for 263 yards. Illinois officially attempted 38 passes as a team, with one additional team attempt.

Iowa now waits in Kinnick Stadium. The Hawkeyes are 4-0 after stunning Michigan 20-19 on a 16-yard touchdown pass from Hank Brown to Reece Vander Zee on the final play of the game.

So Ohio State’s message this week is not complicated. Fix the run defense, fix the communication, and fix the assignments. Saturday will show whether the lesson actually stuck.