In his National Football League preseason debut, Giants running back Barkley delivered with a 39-yard rush on his first touch.
It may have been the first preseason game, but that doesn't change the fact that at least some of the real gameplan made it into this one.
"The whole routine was different for me", Mayfield said. Just some new things for me.More news: GOP Rep. Chris Collins Charged With Insider Trading
He completed four of 11 passes for 70 yards in the first half. "I wouldn't say it was anything nerve-racking, but a lot of firsts today that I'm glad I got under my belt so I can get more comfortable as I go down the road".
Callaway, the Browns' fourth-round pick, played despite being cited for marijuana possession and driving with a suspended license.
Mayfield found tight end David Njoku on a 10-yard TD pass to cap a 14-play, 72-yard drive on his second series. Before he left, he hit Callaway with another dart on a slant that the speedy fourth-rounder turned into a 54-yard catch-and-run score.
It marked the second touchdown of the game for Mayfield and pushed his line up to 212 passing yards and two passing touchdowns on 20 attempts. That's unlikely, as Hue Jackson and John Dorsey have up until now been steadfast in the support of the starter, Taylor, who couldn't have been more efficient in his own Browns debut. Police also found bullets and a gun part in his auto this week.