Power Rankings: No.13 Miami Dolphins

A weekly examination of the Dolphins' ESPN.com Power Ranking:

Preseason: 20 | Last Week: 7 | ESPN.com Power Ranking since 2002

Two weeks ago, the Miami Dolphins were arguably the biggest surprise in the NFL. Miami was off to a 3-0 start with quality wins over the Cleveland Browns, Indianapolis Colts and Atlanta Falcons.

But the Dolphins have fallen six spots to No. 13 with two losses in six days.

There are 18 teams with two or three victories after five weeks. Like more than half the league, Miami is neither a bad team nor an elite team.

Miami has several issues to address, such as its offensive line, lack of running game and various injuries on defense. The Dolphins will get two weeks to heal during the bye. Miami will host the Buffalo Bills (2-3) on Oct. 20 in an important AFC East game.