Giants Upset Packers to Reach N.F.C. Title Game Hakeem Nicks celebrated after catching a touchdown pass. GREEN BAY, Wis. - In the back of the end zone, Mario Manningham danced and shimmied. On the sideline, Tom Coughlin pumped his fist. In the middle of the field, Eli Manning raised his hands. There were still just under seven minutes remaining Sunday, but the Giants knew. So did Green Bay Packers quarterback Aaron Rodgers, who looked nauseous near the Green Bay bench. The Packers" fans at Lambeau Field, so many of them wearing down hunting jackets in the icy air, knew too: they had just seen the kill shot. Again. Four years after the Giants beat the Packers here in the N.F.C. championship game on their way to a Super Bowl title, they did it again Sunday in a divisional game in far more convincing fashion. Manning's 4-yard touchdown pass to Manningham was his third scoring toss of the day as the Giants upset top-seeded Green Bay, 37-20. The Giants will travel to San Francisco next Sunday needing only one more victory to reach the Super Bowl yet again. For the Giants, the victory is a continuation of a run that began Dec. 24, when they beat the Jets to set up a win-and-in matchup with the Dallas Cowboys in the final game of the regular season. They won that, pounding the Cowboys, then beat the Atlanta Falcons in the wild-card round before becoming the first road team in this postseason to win. There have been some familiar ingredients in the Giants" surge, most of which showed up again Sunday. The defense was stellar, shutting down Rodgers and one of the league's most prolific passing offenses. Manning, who passed for 330 yards, provided a steady (if spectacular) hand. There was also a big play from a wide receiver, as Hakeem Nicks sprinted for a 66-yard touchdown reception (one of two scoring catches for Nicks) that set an early tone. As the Giants celebrated, the Packers, who beat the Giants at MetLife Stadium in December and finished the regular season 15-1, looked anguished. Green Bay endured a trying week leading up to the game as the offensive coordinator Joe Philbin lost his 21-year-old son in an apparent accidental drowning last weekend. The funeral for Philbin's son was Friday, though Philbin did coach on Sunday. He saw a team that appeared unnerved all afternoon. Rodgers completed 26 of 46 passes for 264 yards, and the Packers turned the ball over four times with one interception and three fumbles - the costliest of which was Ryan Grant's fourth-quarter fumble that was forced by Kenny Phillips, recovered by Chase Blackburn and was followed, moments later, by Manning's pass to Manningham. The convincing victory was different than the Giants" dramatic overtime win here in 2008 - a game they spent much of the buildup to Sunday's game talking about in interviews and among themselves. Fifteen players who played in that game were active for the Giants on Sunday - seven on offense, six on defense and two specialists - and could speak to the relative balmy temperatures this time around. At kickoff, the temperature was 31 degrees with wind chill in the high teens, or roughly 30 degrees warmer than in 2008. While some Giants still made adjustments for the weather, like punter Steve Weatherford, who purchased battery-operated leg warmers on the Internet for the game, many of the Giants did not even wear long sleeves, including most of the receivers. Nicks was the initiator of that movement, telling his fellow receivers he sensed they played tentative in cold weather earlier in the season. Nicks and the receivers have gone sleeveless since the game against the Jets, and Nicks, in particular, has shown his freedom on the field the past two weeks. Against the Atlanta Falcons, Nicks ripped off a 72-yard touchdown catch, dodging and weaving past would-be tacklers on his way. He followed it up Sunday with a 66-yard reception for a score in the first quarter and an unlikely - if not outright shocking - catch on a desperation pass from Manning on the final play of the first half.