EVANSTON, Ill. (AP) - Denard Robinson threw three interceptions in the first half, each more ugly than the one before it.

In the second half, the Michigan quarterback was nearly flawless, and he kept No. 12 Michigan's record perfect, too, leading the Wolverines a 42-24 win over Northwestern on Saturday night.

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Robinson threw for two touchdowns and ran for two more, helping Michigan come back from a 10-point halftime deficit.

``My teammates kept pushing me and telling me to calm down and just do what you can do,' Robinson said. ``Some throws I could have easily put it on the guy. And I overthrew it. There's some things I've learned from it.'

Robinson threw for 337 yards and ran for 113 as Michigan (6-0, 2-0) scored on its first three possessions of the second half. The Wolverines trailed 24-14 after a first half in which Robinson threw three interceptions.

Michigan's Junior Hemingway caught five passes for 123 yards and Roy Roundtree added five grabs for 83 yards. Both receivers set up touchdowns with big gains by outleaping the Northwestern secondary on what Northwestern coach Pat Fitzgerald called ``fifty-fifty balls.'

Dan Persa threw for 315 yards for Northwestern (2-3, 0-2) which blew a double-digit lead for the second straight week. Jeremy Ebert caught 11 passes for 87 yards for the Wildcats.

But Northwestern was outscored 28-0 in the second half. So what happened?

``Young man named Denard Robinson,' Fitzgerald said. ``He's pretty good. Probably better than we've seen in a while.'

After shutting out Northwestern in the second half, Michigan has allowed just 21 second-half points in six games and has forced nine second-half turnovers.

Michigan has won nine of the last 11 meetings between the schools, though they hadn't met since Northwestern's win at Michigan Stadium in 2008.

With Michigan trailing by 10 points, Robinson came out firing in the second half. He connected with Roundtree on a 57-yard bomb to set up Robinson's two-yard touchdown scamper. After a stop, Robinson led an 80-yard drive, accounting for 68 yards himself, and Devin Gardner scored on a one-yard run to put Michigan up 28-24.

Michigan's Brandin Hawthorne then picked off Persa's tipped pass, setting up Michael Shaw's three-yard touchdown run. Northwestern had the ball for just 2 minutes, 32 seconds during the third quarter.

``We possessed the ball better, so our defense was off the field,' Michigan coach Brady Hoke said. ``We play good defense when we're off the field.'

Ebert fumbled after a short reception from Persa, giving Northwestern two straight turnovers after turning the ball over just two times total in their first four games. After shutting out Northwestern in the second half, Michigan has allowed just 21 second-half points in six games and has forced nine second-half turnovers.

After winning their first five games at home, the Wolverines were playing their first road game of the season, though the Northwestern purple in the crowd at Ryan Field had a liberal sprinkling of Michigan maize that gave the game a Big House-like feel.

The Wolverines started fast. Robinson hit Hemingway on a key third-down pass for 48 yards. The senior outleapt safety Ibraheim Campbell to make a tumbling catch, and Robinson found Steve Watson from nine yards out for the game's first score.

Persa led three long Northwestern scoring drives in the first half. Northwestern's 14 first-quarter points were more than Michigan allowed in its three previous games combined. The Wolverines entered the game allowing just 10.2 points per game, second in the nation and down from 35.2 last season.

``It's frustrating,' Persa said. ``But we have no one else to blame but ourselves. We have to look inside ourselves to see what we need to do to pull it out.'

Meanwhile, Robinson's erratic throws kept Michigan off the scoreboard. Robinson entered the game with a Big Ten-high six interceptions and he threw three more - all on overthrows - in the first half.

``We had three picks, probably should have had five,' Fitzgerald said.

Campbell had two of the interceptions, his second coming on the first play of the second quarter after Michigan reached Northwestern's 16-yard line. It was the second time all season that Michigan didn't score inside the 20 - the first was a kneel-down to end last week's 58-0 win over Minnesota.

But after halftime, it was all Robinson and Michigan, which converted 14 for 17 on third-down conversions in the game.

``The players and coaches all looked at each other and we know we hold each other accountable,' Robinson said. ``I thought I did alright in the second half. I stepped into my throws like I was supposed to.'