The juggernaut Ravens underdogs of more than a field goal at home? The Chiefs catching points against Easton Stick? It must be Week 18 in the NFL, where motivation plays such a huge role in setting and betting spreads and totals. We'll break down our spread power ratings below and give you how much better or worse than average each team is, but we'll have to monitor reports and coachspeak throughout the week to see who is going to play in several of the games where the line would look strange in any other week of the season.

One team whose rating has unquestionably dropped precipitously since midseason is the Philadelphia Eagles. The defense looks broken beyond repair, giving up long drive after long drive first to Tyrod Taylor and the Giants' questionable collection of receiving talent, but then to a Cardinals team led by a quarterback in Kyler Murray who missed a lot of the week's practice while managing an illness and who was without his No. 1 receiver. No problem for either; Taylor got at least to midfield on all five of his drives against Philly, while the Cardinals got at least to the Eagles' 25-yard line on every drive aside from the one that ended the first half (and if they had more than 16 seconds, that one may have ended differently as well).

That leaves the Eagles, who were my top pick to win the Super Bowl before the season, looking like a team that might be one and done once the playoffs start, even if they get to face the NFC South winner in the first round. I'll likely have them rated higher than their opponent in that matchup, but another lackluster effort by the defense this week against the Giants may drop them low enough that when you factor in home field, I might actually set my spread at the Eagles being underdogs.

If you need a refresher on how to build spread power ratings, why they're important for beating the market and how successful I've been with this system at SportsLine, check out the Week 1 version of these power ratings. You can also check out SportsLine on Sunday afternoons as I give my initial power ratings adjustments for each team to get ahead of the market openers before what's typically a Tuesday feature, though that will differ from this point on as we'll turn our ratings around on Monday most weeks moving forward.

Which lines are several points off their power rating projections for Week 18? And which teams are being undervalued by the market? ... Join SportsLine right now to see Week 18 power ratings from the expert who's 535-450-30 on ATS picks from 2017-22, returning $3,532 to $100 players!