Breaking down the Bears' season-opening 24-23 loss to the Green Bay Packers on Sunday night at Lambeau Field.

THREE MOMENTS THAT MATTERED

1. Let's start with when the clock struck zero in the fourth quarter. Yes, it came in Week 1, but that loss was brutal for the Bears' postseason chances. They've been dreadful against the NFC North for much of the last decade, and you absolutely cannot blow 20-point leads against divisional opponents and expect to be playing meaningful football in December.

2. The football hit Kyle Fuller right in the chest. With the Bears leading 23-17, Fuller had a chance to seal the win with an interception. Instead, Packers WR Randall Cobb streaked 75 yards for the go-ahead score just two plays later.

3. Already up 10-0 late in the first half and with Aaron Rodgers in the locker room, Bears DE Roy Robertson-Harris burst through the middle of Green Bay's o-line. DeShone Kizer, in for Rodgers, panicked and fired the football to a waiting Khalil Mack, who returned his interception for a 27-yard touchdown and 17-0 lead. It should have been enough to seal a Week 1 win.

THREE THINGS THAT WORKED

1. Mack wreaking havoc. If that's what the Bears consider easing in their prized pass rusher, I can't wait to see him at full throttle. Just a little more than a week after arriving via trade with Oakland, Mack was a force in his Bears debut. Not only did he have an interception, but he also ripped the ball away from Kizer to force and recover a fumble. The Packers had to account for Mack every time he was on the field.

2. Showing creativity on the opening drive. The Bears opened the season with two RBs, two TEs and a fullback on their first offensive play. OT Charles Leno was lined up wide on two separate occasions, and Nagy found ways to get Cohen and WR Taylor Gabriel in space. This is the creativity Bears fans were hoping for when Ryan Pace hired Nagy. With that being said, the offense is still clearly a work in progress.

3. Showing Kyle Long is healthy. The Bears don't have much depth along the offensive line, and having their best guard healthy is key to the ground game. Long looked comfortable inside, and most importantly, was effective when lead blocking on perimeter runs.

THREE THINGS THAT DIDN'T

1. Third-down playcalling. OK, so maybe Nagy got too creative at times. The Bears failed to pick up first downs twice in the third quarter in third-and-1 situations. The first came on an odd decision to target Dion Sims short of the line to gain. Then with a chance to ice the game with a touchdown or at least take time off the clock with a first down, the Bears targeted Cohen on a wheel route. It failed and the Bears settled for a field goal.

2. Fourth-quarter defense. On the road, up 17 points on a divisional opponent, you simply cannot give up three touchdowns. It doesn't matter if it is to one of the best quarterbacks in the NFL. The Packers made their adjustments to deal with the Bears' pressure, it's concerning the Bears didn't adapt.

3. Mitch Trubisky under pressure. There's no way around it. Trubisky was awful on the Bears' final drive. He missed Robinson and Burton twice, and also overthrew a wide-open Cohen down the left side. When the Bears needed their QB most, he failed miserably.

WHAT'S NEXT?

The Bears return to Chicago for their home opener with the Seattle Seahawks on Monday Night Football. The Seahawks lost, 27-24, to the Broncos on Sunday in Denver.