ENGLEWOOD, Colo. — A week into training camp, Broncos cornerback Chris Harris Jr. set a benchmark for one of the team’s star rookies.



Courtland Sutton, the 6-foot-4 receiver who has a frame like Demaryius Thomas and who attended the same college as Emmanuel Sanders, caught the NFL by storm early by turning the Broncos’ practice field into his own stage, catching jump ball after jump ball, many in the corner of the end zone. He had a size few could match and an athleticism that made him into a three-sport athlete over the years.



His best trick as a pro was a damn good one — sprinting up the sideline and turning around to catch a pass over the arms of his defender.



But Harris knew that one alone wouldn’t cut it.



“He has to learn how to run all of the routes,” Harris said in early August. “In the NFL, you can’t just say, ‘I’m going to run a deep ball,’ and expect it to work 17...