MLB commissioner Rob Manfred has been far from popular as the major don of America's pastime, with his agenda on the pitch clock, universal DH and ghost extra-innings runner being viewed as polarizing.

Bryce Harper's confrontation with Rob Manfred has gained attention across Major League Baseball, and one former player is warning Harper about it.

After Philadelphia Phillies star Bryce Harper got in the face of Major League Baseball commissioner Rob Manfred during a heated meeting last week, Mark DeRosa, a former big leaguer who now works for Manfred, said something some players took as a threat, according to four people who attended the meeting or were briefed on it.