The 48-year-old `Moneyball` star didn`t make it on to the first squad at Cherokee Middle School in his hometown of Springfield, Missouri, in 1977 - and so formed his own group of cast-offs.
Calling themselves the Cherokee Rejects, 14-year-old Brad and his friends had their t-shirts emblazoned with the tongue-in-cheek name, and had his dad Bill coach them.
School friend and Rejects player Aaron Stull told RadarOnline.com: "We were the Cherokee Rejects. We didn`t make the final cut for the eighth grade basketball team, so the five of us just decided to be the Cherokee Rejects.
"It was Brad`s idea and he got his dad Bill to be our coach at the time.
"Brad came up with the name - Cherokee Rejects. I don`t think we really cared too much about losing out on the school team, we just thought it was funny."
Brad - who raises six kids with partner Angelina Jolie - admits another sport he didn`t excel in was baseball.
He confessed: "It`s shameful how little I know about baseball. Baseball and I didn`t get along that well. I wrestled one year [in highschool]. I dove one year. Everything but baseball."