SANTA CLARA, Calif. -- Nick Bosa clearly hasn't forgotten that Cleveland Browns quarterback Baker Mayfield planted the Oklahoma flag in Ohio Stadium two years ago.

After knocking Mayfield down to force intentional grounding at the end of the first half of Monday Night Football, the San Francisco 49ers' pass-rusher celebrated by mimicking waving a flag, then planting it, with Mayfield flat on the ground behind him.

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 and planted it inside Ohio State's block O logo.