Mayfield wasn't getting any of the first-team reps, which had gone to Tyrod Taylor.
Naturally, Cleveland celebrated like it just won a Super Bowl.
If nothing else, his reaction was much better than last week's - when James came at kicker Zane Gonzalez after missing two critical field goals and extra points in the Browns' loss to the New Orleans Saints. Not winning a game for almost two entire YEARS could honestly make a fan go numb to the fact that they are actively rooting for a team anymore.
"We call it the "Philly Special", guard Joel Bitonio said. As I said, I wanted to really watch tape and talk to the staff and talk to John and then make a decision from there. But towards the end of the third quarter, the Browns offense finally found the end zone, thanks in part to the No. 1 pick in the 2018 NFL Draft. But it all changed when Mayfield entered and immediately started throwing darts.
Mayfield's highlight reel for the game included catching a pass on a two-point conversion.
"He always keeps one joke in the chamber", Mayfield said of Riley on SportsCenter with Scott Van Pelt.
Twitter had a lot of feelings about Mayfield's performance.
Fans were double-taking the win since the Browns hadn't seen a regular season victory since December 2016.