SANTA CLARA, Calif. — San Francisco 49ers defensive end Nick Bosa has a long memory. So long, in fact, that as he spent most of Monday night in Cleveland Browns quarterback Baker Mayfield‘s face, he harkened back to what Mayfield did on Sept. 9, 2017.

That was the night Mayfield planted an Oklahoma flag at midfield of Ohio Stadium. The thought of it has remained etched in Bosa’s mind since. Which is why, as the Niners prepared to play the Browns on Monday night, Bosa planned a sack celebration in which he would mimic Mayfield’s celebration if he got the chance.

Sure enough, Bosa dropped Mayfield to force an intentional grounding with 10 seconds left in the first half of San Francisco’s 31-3 win at Levi’s Stadium. Bosa jumped up, ran a few yards down the sideline nearest the 49ers bench and began waving and then planting an imaginary flag in a way that closely resembled what Mayfield did two years ago.

“I think everybody knows what that was for,” Bosa said. “I just wanted to get payback. He had it coming.”

According to Bosa, the celebration was something he concocted over the 49ers’ Week 4 bye in conjunction with Sam Hubbard, another former Buckeye and current Cincinnati Bengals defensive end.

Bosa said he mentioned the possibility of the celebration to Hubbard, who told him that he, too, had planned to do it if he was able to sack Mayfield this year. Bosa even went so far as to practice the celebration a little bit in his room over the bye so as to do it as accurately as possible.

And if it wasn’t clear from the flag-planting that Bosa remembered Mayfield’s collegiate celebration, he said he also took part in a little trash talk, something he doesn’t normally do.

According to Bosa, he spent much of the night screaming “Ba-ker, Ba-ker” and telling Mayfield to “pick it up, we want a challenge.” Bosa said Mayfield didn’t respond much.

“I don’t know how anybody thought he would be able to see over Arik [Armstead] and [DeForest] Buck[ner],” Bosa said. “But he was panicking. He was double clutching, rolling back and forth. We had him rattled all game.”

Mayfield finished the game 8-of-22 passing for 100 yards with no touchdowns and two interceptions for a passer rating of 13.4. He was pulled in the fourth quarter in favor of Garrett Gilbert after the game got out of hand.

Two years ago, Mayfield led the Sooners to a 31-16 victory over Bosa and the Ohio State Buckeyes, which helped propel Oklahoma to the College Football Playoff. After the win, Mayfield took the OU flag to midfield, waved it around, then planted it inside Ohio State’s block O logo.

Mayfield said he wasn’t aware of the celebration until just before his postgame media availability. He didn’t have much to say when asked about it.

“Good for him,” Mayfield said. “Good play.”

The hit on Mayfield was one of many good plays for Bosa on a night when he led the charge for San Francisco’s dominant defensive performance.

San Francisco coach said after the game he was not surprised by Bosa’s early-season impact and, for what it’s worth, was not bothered by the celebration.

“I mean, as long as it wasn’t an Ohio State flag or something, I’m cool with that,” Shanahan said. “Hopefully, it was a Niner flag and he didn’t offend anybody. Hopefully he enjoyed it.”

’s Jake Trotter contributed to this report.