BEREA — The joke about Jon Gruden was he never met a quarterback he didn't like.

During his years of conducting QB Camp as a hit ESPN draft feature, Gruden especially liked Johnny Manziel.

Now, as coach of the Oakland Raiders, Gruden finds himself comparing the 5-foot-11 3/4 Manziel to Baker Mayfield, the undersized passer he will face Sunday when the Browns invade.

"Obviously Johnny had some issues off the field," Gruden said. "His ability to come in on a consistent basis and concentrate and master a system didn't happen. It doesn't matter if you're 6 feet tall or 8 feet tall. If you can't string together really good days of concentration, you're going to have a really hard time.

"I think Mayfield has probably been very consistent in his approach. I would expect that [Browns offensive coordinator[ Todd Haley and [Browns coach] Hue Jackson have mentored him and he's probably responded quite well. And that's the difference.

"You have to be a consistent grinder and prove to your teammates how important that is to you to earn their respect."

Gruden got cozy with Manziel during a memorable episode of QB Camp before the 2014 draft.

"I look at Johnny Manziel on film, it's just different," Gruden said at the top of the show four years ago. "... I've never see the position played like Manziel plays it."

The Browns drafted Manziel at No. 22 overall. The pick contributed to a slide into oblivion that left them with consecutive No. 1 overall picks, the latter of which they spent on Mayfield.

Gruden 'taught me football'

Jackson and Gruden, rival coaches in Sunday's Browns-Raiders game, both were Raiders head coaches under the late Al Davis.

They have more in common than that.

They spent the 1989 season together as assistant coaches at the University of Pacific, where Jackson finished his playing career as a quarterback.

“We were office mates," said Jackson. "He taught me football. We used to argue every day. I know him extremely well.

"He is extremely competitive, and he does not like losing, no more than me. Trust me, he is going to get his football team ready to go.”

Jackson and Gruden worked at Pacific under coach Walt Harris.

"I have known Jon for a lot of years," Jackson said. "Jon tried to hire me when he was first at the Raiders [in 1998], and I decided to stay at USC [as offensive coordinator].

"We have history. I worked with his brother [Redskins coach Jay Gruden], as well, through my travels.

"The guy is a tremendous football coach.”