Nick Bosa doesn't forget.

While the San Francisco 49ers rookie defensive lineman was at Ohio State in 2017, Baker Mayfield's Oklahoma Sooners defeated the Buckeyes on Ohio State's home turf, and Mayfield proceeded to plant a Sooners flag at midfield.

Well, on Monday night, the 49ers routed the Cleveland Browns by a score of 31-3, and afterward, Bosa planted a Niners flag in the end zone.

Mayfield's reaction to Bosa's payback?

“Good for him…good play,” he said, via Jake Trotter of ESPN.

Bosa had a terrific game, logging four tackles and a couple of sacks as San Francisco improved to 4-0 on the season. Meanwhile, Mayfield had what was probably the most forgetful performance of his NFL career, completing just eight of his 22 passes for 100 yards and a couple of interceptions.

Just when it looked like the Browns were coming out of their early-season slump after routing the Baltimore Ravens 40-25 on the road last weekend, Cleveland posted what was possibly its worst performance of the season on Monday evening.

Not only did the Browns go nowhere offensively, but their defense was absolutely shredded, particularly on the ground, where they surrendered 275 yards and a pair of touchdowns.

Mayfield has certainly not lived up to expectations after a brilliant rookie campaign, as he has thrown for 1,247 yards, four touchdowns and eight picks while completing just 55.9 percent of his passes and recording a passer rating of 68.5 through five games.

Cleveland dropped to 2-3 with the loss and will now head back home to host the Seattle Seahawks next Sunday.