Purdue upsets Illinois, 24–17
Purdue closed as a 9.5-point underdog and won outright.
Final24–17
Upset size9.5
Rank in 202622nd of 61
It was the 4th-biggest of 10 upsets in 2026 Week 5, and the 22nd-biggest of the 2026 season. It was Purdue's only upset win of 2026.
Other upsets in 2026 Week 5
No. 25 Missouri 45, 
No. 8 Florida 17Upset size14
Bowling Green 24, 
Miami (OH) 20Upset size10.5
San Diego State 31, 
Texas State 29Upset size10- Upset size6.5
Temple 17, 
South Florida 13Upset size5.5
More: Purdue upsets · Illinois upsets · all Week 5 upsets · the 2026 season · how upset size works