Remember two weeks ago when we were debating Ohio State versus Michigan as the Big Ten's top team? Well, the Buckeyes have created some separation from Michigan and the rest of the league with two dominant offensive performances. Michigan, meanwhile, either has a massive hangover from beating Notre Dame or a lot of issues to sort out.
We gave the Wolverines the benefit of the doubt after the Akron game and kept them at No. 2. After Saturday night's slopfest at Connecticut, we can no longer keep Michigan in the second slot. Northwestern looked lackluster for the second straight week but avoided the major scare Michigan has endured. Wisconsin, meanwhile, might be the league's second-best squad. We'll find out a lot about the Badgers this week in Columbus.
Minnesota and Iowa make nice moves this week, while Indiana takes a tumble.
As a reminder, we keep these rankings consistent with how we vote in the ESPN.com Top 25. Here's one final look at last week's power poll.
Let's get to the rundown ...
1. Ohio State (4-0, last week: 1): We'll finally get a gauge on these Buckeyes as they open Big Ten play Saturday night against Wisconsin, but the recent results have been encouraging. Braxton Miller's absence once again didn't faze Ohio State, which scored 34 points in the first quarter and received a nice boost from running back Carlos Hyde in his season debut. Backup signal-caller Kenny Guiton continued his surge with a school-record six touchdown passes. Miller likely returns this week, but the Buckeyes' offense clearly is more than just one man this season.
2. Northwestern (4-0, last week: 3): For whatever reason, Northwestern looks worse against weaker nonleague foes than seemingly stronger ones. The Wildcats had more positives against Cal and Syracuse than Western Michigan and Maine, although they were never in serious danger of losing in the past two weeks. Linebacker Damien Proby sparked a takeaway-driven defense Saturday. Quarterbacks Kain Colter and Trevor Siemian struggled but have two weeks to prepare for Ohio State, when running back Venric Mark is expected back.
3. Wisconsin (3-1, 1-0 Big Ten; last week: 4): Credit Gary Andersen's players for not letting last week's unfortunate ending linger as they opened Big Ten play against Purdue. Wisconsin went back to what it does best, overpowering opponents with the run game, as Melvin Gordon and James White combined for 292 rush yards and four touchdowns. The Badgers' defense bottled up Purdue, surrendering only 12 first downs, 45 rush yards and 180 total yards. You have to like how Wisconsin is performing before this week's showdown in Columbus.
4. Michigan (4-0, last week: 2): The Akron game could be forgivingly dismissed as a letdown. But when many of the same issues surface for the second straight week against a poor opponent, it's reason to be concerned. Michigan won't stay perfect much longer if quarterback Devin Gardner keeps turning over the ball (he leads the nation with 10 turnovers) and the offensive line endures periods of inconsistent play. Coach Brady Hoke and his staff have plenty of items to address this week before the Jug game against potentially undefeated Minnesota.
5. Nebraska (3-1, last week: 6): After a turbulent eight days, Bo Pelini wanted his players to have some fun in their final nonleague tuneup. The offense had plenty despite playing without top quarterback Taylor Martinez, eclipsing 300 pass yards and 300 rush yards. Reserve quarterbacks Tommy Armstrong and Ron Kellogg III both performed well. The defense had a lot less fun, however, surrendering 465 yards in a performance that Pelini labeled its worst of the season. Nebraska has to get a handle on its defense this week before opening Big Ten play against Illinois.
6. Minnesota (4-0, last week: 7): Knock San Jose State if you must, but the Spartans provided the biggest test for Minnesota to date, and the Gophers passed it with flying colors. Minnesota showed the physical dominance coach Jerry Kill has been waiting for, piling up 353 rush yards and six touchdowns behind quarterback Mitch Leidner and running back David Cobb. Although San Jose State's David Fales showed why he's an NFL prospect, the Gophers continued to force turnovers. Minnesota hosts Iowa this week in a game that has more than bacon on the line.
7. Michigan State (3-1, last week: 5): The Spartans looked like the better team for much of Saturday's game at Notre Dame. But many of the same issues that surfaced in close losses last season -- stalled drives, dropped passes, not enough takeaways and missed field goals -- surfaced in a 17-13 setback. Coach Mark Dantonio and his players say this feels different, and that they can overcome their errors to make some noise in a wide-open Legends Division. The defense remains championship-level, but there are other issues to sort out, namely quarterback.
8. Penn State (3-1, last week: 8): Kent State's woeful offense turned out to be the perfect cure for a Nittany Lions defense that struggled mightily in a Week 3 loss to Central Florida. Safety Ryan Keiser and cornerback Jordan Lucas helped trigger Penn State's first shutout since 2010, as the Lions allowed only nine first downs and 190 total yards. The run game once again surged behind Akeel Lynch (123 rush yards) and others. Penn State's defense will face much greater tests when Big Ten play begins in two weeks.
9. Iowa (3-1, last week: 11): Kirk Ferentz's crew is clearly on the rise after its most complete performance in recent memory. Iowa received numerous contributions on offense, two punt return touchdowns from Kevonte Martin-Manley and a pick-six from B.J. Lowery -- all during a 38-point first half against Western Michigan. Lowery added another pick-six in the second half and stomped the Broncos. After a rough start to the season, Iowa has the momentum it needs heading into a pivotal Big Ten opener against Minnesota.
10. Illinois (2-1, last week: 10): The Illini sat back and watched the rest of the Big Ten in Week 4, enjoying the first of two open weeks. They'll have an excellent chance to improve to 3-1 this week against an 0-3 Miami (Ohio) squad that was shut out Saturday against Cincinnati and has scored just 21 points in its first three games. This is the perfect opportunity for Illinois' defense to rebound after getting gashed by Washington in Week 3. Illini quarterback Nathan Scheelhaase tries to bounce back after completing just 9 of 25 pass attempts.
11. Indiana (2-2, last week: 9): Just when Indiana appears ready to turn a corner, it becomes Indiana again. For the second time in three games, Indiana limped out of the gate and fell behind, never finding a good offensive rhythm and struggling to stop Missouri's balanced attack. Missouri piled up 623 yards, a Memorial Stadium record for an Indiana opponent. The Hoosiers' defense remains far too vulnerable, and quarterback Nate Sudfeld struggled, throwing three interceptions. There's a lot to fix in the open week before Penn State comes to town.
12. Purdue (1-3, 0-1 Big Ten; last week: 12): Trips to Madison haven't been kind to the Boilers, and Saturday's proved to be no exception as Darrell Hazell's team took a step back after an encouraging performance against Notre Dame. When you can't run the ball or stop the run, you have no chance, and Purdue struggled mightily in both areas. Hazell admits Purdue must do some "soul searching" following a rough start, and things don't get any easier this week against Jordan Lynch and Northern Illinois.