It's Monday, and the final week of MLS action is in the books, which means it's time for ESPN's Power Rankings.

Who looks the strongest heading into the postseason? Who may be one and done? Our writers studied the action from across Decision Day to come up with this week's order of the playoff participants. Let's dive in.

1. Philadelphia Union

There are a few things working against the Union. They ended the season with a 2-0 loss to Charlotte on Decision Day, and just two Supporters' Shield winners in the past decade have also lifted MLS Cup. Still, Philly racked up the most points of any team this year with a combination of strengths that have propelled teams to the title before -- namely a resolute back line and a veteran goalkeeper.

2. Inter Miami CF

Bet against Lionel Messi at your own peril. The Argentine superstar capped an MVP season with a hat trick and an assist in a 5-2 win over Nashville, the very team Miami now will face in a Round One series. Questions at the back persist, but what Messi, Luis Suárez & Co. can do going forward may be enough to paper over those deficiencies.

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Nashville SC vs. Inter...