IOWA CITY, Iowa — Penn State is perfect no more, its hopes for giving coach Joe Paterno another national title given a sharp and surprising kick by Iowa.

Daniel Murray hit a 31-yard field goal with a second left and Iowa rallied to stun the third-ranked Nittany Lions 24-23, likely dashing Penn State's hopes for a spot in the BCS national title game.

Shonn Green rushed for 117 yards and two touchdowns, and Ricky Stanzi bounced back from an interception and a fumble to lead the Hawkeyes (6-4, 3-3 Big Ten) on their game-winning drive, which came after Daryll Clark threw an interception.

The Nittany Lions were third behind Alabama and Texas Tech in the last Bowl Championship Series standings, in danger of being squeezed out of the national title game even if they stayed unbeaten.

That's not a concern anymore.

The Big Ten title and a Rose Bowl berth are the Nittany Lions' main goals now. Paterno's third national title is a long shot.

Iowa was down 23-14 heading into the fourth quarter. But Greene scored his second TD, from 6 yards out, to make it 23-21 with 9:20 left.

On the next possession, Penn State looked as if it got a break, when Iowa was called for a roughing the punter penalty that had the Hawkeyes seething. The Nittany Lions kept the ball and continued its time-consuming march.

But Clark made an errant throw down the middle that was picked off by Tyler Sash, who returned to Iowa's 29 with 3:46 left.

Then Iowa caught another break when Penn State was flagged for pass interference, getting the Hawkeyes near midfield with a first down.

Stanzi hit Derrell Johnson-Koulianos at the Penn State 15 with 18 seconds left to set up Murray's kick, which he drilled into a swirling and strong wind.

For Iowa, it was the Hawkeyes' first win over a top five team since 1990, when they beat Illinois 54-28.

Stanzi was 15-of-25 for 171 yards.

Clark was 9-of-23 for 86 yards to lead Penn State (9-1, 5-1), which had to settle for Kevin Kelly's field goals on three different trips inside Iowa's 20.

Derrick Williams and Evan Royster each ran for touchdowns for the Nittany Lions, who were seeking their first 10-0 start since 1994.

The Nittany Lions did their best to squeeze the life out of the Hawkeyes. On a day where the wind chill dipped into the 20s, Penn State held the ball for nearly 36 minutes and ran almost twice as much as they threw it.

It worked for the first three quarters, as Penn State led 23-14 heading into the fourth.

Penn State's Tyrell Sales picked off Stanzi on the opening drive of the third quarter, and Kelly's 25-yard field goal put the Nittany Lions ahead 16-7.

Iowa's offense finally woke up, reeling off a 73-yard drive that Stanzi capped by finding a wide-open Johnson-Koulianos for a 27-yard touchdown pass to pull the Hawkeyes within 16-14 with 4:43 left in the third.

But Stanzi fumbled away the ball and Iowa's momentum just two minutes later, giving Penn State the ball deep in Iowa territory after botching the snap. The Nittany Lions wasted little time turning Stanzi's mistake into points, as Williams' 9-yard touchdown run put Penn State back up 23-14 heading into the fourth.

Penn State held the ball for an astounding 23:34 and outgained Iowa 203-70 in the first half. But the Hawkeyes forced the Nittany Lions into a pair of red-zone field goals, keeping Penn State's lead at 13-7.

After falling behind 7-0 early in the first quarter, the Nittany Lions put together scoring drives of 71, 75 and 78 yards — all powered by the running game. They had to settle for 24-yard field goal by Kelly on the first one, but Royster ran for a 2-yard score to give Penn State a 10-7 lead early in the second quarter.

Kelly drilled a 31-yarder into a swirling wind with 55 seconds left in the first half to push the lead to six.

Iowa forced Clark to fumble on the game's opening drive, but the officials said he got it back it at the Penn State 1. The Hawkeyes thought they had recovered the ball in the end zone, but they had to settle for a Nittany Lions punt and a short field.

Greene made Penn State pay just two plays later, scoring on a 14-yard touchdown run that put Iowa ahead 7-0.