Iowa's Stanzi taken to locker room with injury
Stanzi was drilled by Corey Wootton, and his fumble was recovered by Marshall Thomas for a touchdown that brought Northwestern within 10-7.
Stanzi was limping as he was helped off the field. He was replaced by redshirt freshman James Vandenberg, whose first pass was intercepted.
Stanzi was 4 of 9 for 134 yards with a touchdown and an interception before leaving the game. He came into the game 17-3 as the starter since taking over the middle of last season.