John Brown has been very impressive in training camp and preseason with the Arizona Cardinals.

Brown was a third round draft pick out of Pittsburg State.

"I haven't seen a rookie come in and do what he's done -- and it's early still -- since Anquan Boldin," Steve Keim told Grantland's Robert Mays on Monday. "This guy came through the first day, and being from Pittsburg State, has uncanny instincts, unbelievable understanding of route concepts, leverage, being in the right spot at the right time. On top of great ball skills, he has unusual speed and explosiveness."

Ron Wolfley compared Brown to Marvin Harrison.