Fourth in an 11-part series. Coming tomorrow: Offensive linemen.

Harold Fannin Jr. wasted no time easing concerns over how he would perform when Bowling Green faced a step up in competition.

On the first play against Penn State last September, Fannin caught a 30-yard pass down the seam — just like he did countless other times throughout the best receiving season by a tight end in college football history. Bowling Green’s second play was a 4-yard run that required Fannin to line up opposite edge rusher and likely top-three-overall pick Abdul Carter.

“I tell scouts, ‘Watch the second play of the game,’ ” Bowling Green tight ends coach Alex Bayer told The Post. “He goes one-on-one against Abdul Carter and drives him 5 yards off the ball. Everyone says Harold is a receiving guy and he can’t block, but [Carter] is a stud.