Percy Harvin's return to the lineup didn't last. The Seattle Seahawks wide receiver was knocked out of Saturday's 23-15 divisional round victory over the New Orleans Saints with a concussion. Harvin was hurt while attempting to pull in a Russell Wilson pass late in the second quarter. He took a hard hit in the end zone and his helmet appeared to make hard contact with the turf at CenturyLink Field. The evolution of the NFL:Take a look at how the NFL has evolved
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