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The one thing the No. 1 overall pick didn't do?

He completed four of 11 passes for 70 yards in the first half.

Replacing starting quarterback Tyrod Taylor late in the first quarter, Mayfield threw two touchdowns in two-plus quarters to help the Browns beat the Giants 20-10 on Thursday night.

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. Yes, he looked like a seasoned veteran as he went through his progressions and delivered an end-zone bullet through traffic to tight end David Njoku for his first unofficial National Football League passing TD.

Given how many times coach Hue Jackson has been asked about his starter for 2018, and how he has consistently answered with Taylor, there's enough for a "Hard Knocks" spinoff show.

Mayfield returned in the third quarter to spin additional magic, rolling to his right on a third-and-7 from his own 22 to find rookie Antonio Callaway along the sideline for 24 yards.

The Browns let Mayfield play into the fourth quarter after he entered in the second.

Mayfield said he didn't experience any jitters in his preseason debut, but did acknowledge that he was glad to get the first game under his belt.

His first series ended with a three-and-out, but he quickly led the Browns on an impressive touchdown drive the next time he got the ball.