The Green Bay Packers are in a three-way tie for the NFC North Division lead with six games left.
The Packers, Minnesota Vikings, and Chicago Bears are all 5-5 after the Pack crushed the Bears 37-3 Sunday at Lambeau Field.
The Vikings could have taken sole possession of first, had they not fallen at Tampa Bay 19-13.
The Bears lost their annual game at Lambeau for the first time since Lovie Smith became the coach in 2004.
Packers' Head Coach Mike McCarthy said it was an important game for their season. It ended Green Bay's two-game losing streak.
"I'm proud of the way they work, I'm proud of the way they approach the game, but we needed to get our execution at a high level. And we did that today," McCarthy told reporters after the game.
Ryan Grant ran for 145 yards and a touchdown only his second 100-yard performance of the year.
McCarthy said the ground game was key to the Packers' domination.
"This is November football and this is how you have to do it. There's no doubt about it. I thought the run-blocking unit, in particularly the offensive line, time and time again, we were able to get the movement up front and get the back to the second level. That was big," McCarthy said.
Aaron Rodgers threw for 237 yards and a pair of scores behind a much-improved Packer offensive line.
Rogers told reporters that the offensive line had been taking heat all week, not just from the media, but in the locker room too and they had something to prove.
"I had a lot of confidence in them, every position, but I feel like they had something to prove today and they did. They did a great job," Rogers said.
Rodgers, who got sacked four times at Minnesota last week, was not sacked at all Sunday. He completed 23-30 passes, with one interception.
The Packers set a new team record with their seventh defensive touchdown of the year, when Jason Hunter returned a Kyle Orton fumble 54 yards for the Pack's final touchdown in the fourth quarter.
"It feels real good. It's exciting," said Hunter. "I had a touchdown in college, I don't think I had one in high school. But it feels great to get an NFL touchdown. I'm so happy and excited."
Mason Crosby booted three field goals, including a career-long-tying 53-yarder and the Packer offense churned out 427 total yards to the Bears' 234.
The Bears' only score came early in the second quarter on a Robbie Gould 35-yard field goal.
Orton, who sat out last week with a sprained ankle, completed 13-26 passes for 138 yards. Rex Grossman relieved him in the fourth quarter and completed four passes for 26 yards.
"Defensively, they (the Packers) are very good. They are aggressive, and they really took it to us. We didn't do anything on offense and it is tough to win when you do that," said Orton.
Bears' rookie Matt Forte had 104 all-purpose yards, including 64 on the ground. Donald Lee caught six passes for 33 yards for Green Bay and Greg Jennings was the leading yardage receiver with 64 on five catches.
Green Bay returns to action a week from tonight (Monday)at New Orleans.