NFL free agency began on Monday with the legal negotiating window, and we've already seen a ton of offseason action -- including a few surprising moves. Sam Darnold, Justin Fields, DK Metcalf, Davante Adams, Josh Sweat, Milton Williams and D.J. Reed are among the biggest names who have changed teams via free agent signings and trades.
ESPN analytics writer Seth Walder is grading the biggest signings and trades of the offseason, putting each deal into perspective for teams and players.