Here's how it started ... Rovell posted a tweet on Wednesday comparing 2 Sports Illustrated cover stories from 7 years ago. ... featuring the Alex Rodriguez steroid scandal as well as the "Johnny Football" craze.
Rovell says A-Rod was at "Rock Bottom" back then while Manziel was the "envy of the college football world."
He then points out that in 2020, the tables have apparently turned.
"Today, A-Rod is as relevant as ever. Manziel achieves a flash of relevance by flipping off a building into a pool."
Side note -- it was a pretty impressive flip.
@jmanziel2 / Instagram
Manziel clearly feels Rovell's tweet was an unwarranted cheap shot -- and fired back Wednesday with one of his own.
"Seven years later and you’re still as big of a bitch as ever."
Rovell hasn't responded to Manziel and when we reached out, Rovell issued a "no comment."
Shocker, there's some bad blood between the two men that goes back years -- and it apparently all started in 2013 when Rovell investigated whether Manziel was signing autographs for cash while at Texas A&M.
Turns out, Rovell was on to something -- and Manziel was suspended by the NCAA for one-half of a football game.