Peyton Manning -- Hey Eli ... My Guys Can Hoop, Too!!

The man in the gray isn't his team's designated 3-point shooter ... it's Peyton Manning ... who took some time away from the gridiron for some hoops action with his Broncos teammates at Duke University.

Manning is currently hosting a passing camp at Duke -- but in between sessions, #18 got together with teammates (including wide receivers Cody Latimer, Emmanuel Sanders and defensive end Kenny Anunike) for a pick up game.

The pic comes just a couple days after his brother Eli posted one just like it on the same exact court -- except he was flanked by Giants teammates Odell Beckham Jr. and Victor Cruz.

So we gotta ask ... in a b-ball battle of the brothers, who ya got?