NFL Power Rankings: Where the final three undefeated teams stand heading into Week 5

With Week 5 of the NFL season approaching, attention is turning to the handful of teams that remain undefeated and how they compare to the rest of the league in a full top-to-bottom ranking of all 32 franchises.

Separating the contenders from the rest

Power rankings at this point in the season aim to capture more than just win-loss records, factoring in strength of schedule, point differential, injuries and the overall quality of performances through the first month of play. For the remaining undefeated teams, maintaining that status has drawn added scrutiny over whether their records reflect genuine early-season strength or a favorable run of matchups.

Elsewhere in the rankings, teams that have stumbled out of the gate face questions about whether early struggles stem from correctable issues or point to deeper problems that could define their season.

As the league heads toward Week 5, the gap between the top and bottom of the rankings is expected to narrow for some teams and widen for others, with each week's results offering new evidence for how the full 32-team picture should be read.

The coming slate of games will offer a fresh test for the league's last unbeaten teams, as well as an opportunity for struggling franchises to begin climbing back up the rankings.