Which team in the NFC North improved itself most through free agency? ESPN's NFC North reporters make their picks:
Rob Demovsky, Packers reporter: The Vikings' lack of running game last season after Adrian Peterson's knee injury ultimately prevented them from living up to expectations. Enter Latavius Murray, the former Raiders running back who should flourish with the help of a rebuilt offensive line that included fellow free-agent signings Riley Reiff and Mike Remmers. With a running back like Murray, the top-ranked back on ESPN's list of the top 150 free agents, the Vikings should be back to challenging the Packers and Lions for playoff spots out of the NFC North.