A numbers-first look at Week 4 as Ohio State opens Big Ten play against Illinois, compiling FPI, SP+, Sagarin, Massey and underlying play-level metrics to assess the matchup and the areas that could determine the result.
Ohio State has clear advantages in overall ratings and defense, but the Buckeyes struggled in third-down conversion, red zone production and the rushing attack in their last game — margins where Illinois could stay competitive.
Advanced play-level metrics show Ohio State’s pass offense outperforms Illinois’ pass defense in EPA per pass, while Illinois generates more available yards on offense than Ohio State’s defense allows.
# Quick snapshot
Ohio State is the analytical favorite across virtually every model for its Week 4 Big Ten opener against Illinois. Models — including FPI, SP+, Sagarin, Massey and The Power Rank — project a decisive Buckeye win, but the preview highlights specific in-game margins where Illinois could make the game closer if Ohio State fails to correct recent execution issues.
# What the big models say
These models align on the outcome: Ohio State should win comfortably. Projected scores cluster in the mid-30s for Ohio State and mid-to-high-teens for Illinois.
# Under-the-hood metrics that matter
The preview pulls Game On Paper metrics to show matchup-level strengths and weaknesses.
Ohio State offense vs. Illinois defense
Illinois offense vs. Ohio State defense
Key game margins: third-and-fourth down success rates and starting field position show small differences that can swing drives. Ohio State's Starting Field Position average (Own 33) is slightly better than Illinois' (Own 30), a small but relevant edge for scoring opportunities.
# Where Illinois could make it interesting
# Historical context
Ohio State leads the series 69-30-4 and has won the last 10 meetings. Ryan Day has faced Illinois once as Ohio State's coach, a 34-16 win in 2025. Illinois' most recent series win was 2007.
# Bottom line
Analytical consensus: Ohio State should win by multiple possessions. The most important practical variables to watch are Ohio State's third-down conversion, red zone scoring and rushing effectiveness. If those marginal areas improve, the projected outcome becomes more lopsided. If they don't, Illinois has a clearer path to keep the game competitive.
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