Austin Sumner tossed a 5-yard touchdown pass to Trevor Tiefenthaler with seven seconds left in the game as South Dakota State rallied to defeat Southern Illinois 16-12 on Saturday.
South Dakota State (6-2, 5-1 Missouri Valley) also got field goals of 28, 41 and 33 yards from Justin Syrovatka.
Sumner was sacked six times, but still managed to complete 26 of 25 passes for 284 yards.
Kory Faulkner completed 20 of 30 passes for 122 yards for Southern Illinois (5-5, 4-3) and was sacked three times.
Bo Helm recovered a fumble for South Dakota State.