AP Sports SummaryBrief at 7:20 a.m. EDT

Analysis: Vikings, Ravens, Buccaneers and Commanders were up for the challenge in a prove-it week Sam Darnold and the Minnesota Vikings were the biggest surprise in September.

Trevor Lawrence and the Jacksonville Jaguars were the top disappointment.

NFL teams spend the first month of the season establishing their identity.

Some figure it out faster than others.

Week 4 was filled with prove-it opportunities for many across the league.

The Vikings, Ravens, Buccaneers and Commanders were among the teams up for the challenge.

The Jaguars, Eagles, Jets and Browns were on the opposite end of that..

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