Posted by ESPN.com's Adam Rittenberg
IOWA CITY, Iowa -- Michigan's secondary has been a weakness all season, and Iowa quarterback Ricky Stanzi knows it.
Stanzi repeatedly took advantage of the Wolverines' back four on a 9-play, 78-yard scoring drive. The key play came on third-and-24 after a bad snap pushed back the Hawkeyes. Most teams would run a draw or a screen to set up a punt, but Iowa wisely attacked downfield and Derrell Johnson-Koulianos made an electrifying grab over cornerback Donovan Warren.
Iowa surprisingly continues to attack Warren, the Wolverines' best defensive back, but Stanzi is having success. He also found a leaping Trey Stross for a 33-yard gain on third-and-6. Stross also beat Warren.
If the Wolverines don't improve in the back four or generate more pressure on Stanzi, Iowa could start to pull away.