No one saw this coming.
The Packers dominated the first half, outscoring the Cowboys at every stage, taking a 27-7 lead into the locker room at halftime.
Green Bay outgained Dallas 217 to 150 yards, with two picks from Dak Prescott leading to 14 points.
Jair Alexander, who was questionable to play after a freak ankle injury in practice, intercepted Prescott on a pass intended for Brandin Cooks at the Dallas 19. Three plays later, Aaron Jones had his second touchdown of the day.
With 1:50 remaining in the first half, Darnell Savage made the Cowboys' day go from bad to worse with a 64-yard scoring drive from Prescott on a pass intended for CeeDee Lamb. Gave the Packers a 27-0 lead.
Prescott threw just nine interceptions in the regular season.
The Packers also had scoring drives of 75 and 93 yards and converted five of six third-down plays in the first half.
Jordan Love was 13 of 16 for 185 yards and a touchdown, a 20-yard toss to Dontayvion Wicks, and Romeo Dobbs had four catches for 102 yards. Aaron Jones rushed for 30 yards on 12 carries.
The Cowboys didn't get on the scoreboard until the final play of the half with a 1-yard throw from Prescott to tight end Jake Ferguson. It completed a 12-play, 55-yard drive following a 47-yard kickoff return by KaVontae Turpin.
Prescott is 13 of 21 for 87 yards with a touchdown and two interceptions. Lamb has just two catches for 18 yards, while Ferguson has four for 31 yards. Tony Pollard rushed for 30 yards on eight carries.
Cowboys coach Mike McCarthy, who previously led the Packers to a Super Bowl title, could be coaching for his job in the second half. Despite three straight 12-win seasons, Day entered just 1-2 in the postseason with a loss to the 49ers at home in the Wild Card round two years ago.
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