Marc Anthony, Sports Agent

Anthony founded Magnus Media this year and said Nov. 30 it is forming a joint venture that will represent Cincinnati Reds flame-throwing relief pitcher Aroldis Chapman.

Praver Shapiro Sports Management, part of the joint venture, is headed by agents Barry Praver and Scott Shapiro.

Chapman is widely considered the fastest-throwing pitcher in the major leagues. He is eligible for free agency after the 2016 World Series.

Jay Z, whose real name is Shawn Carter, is partners with CAA Sports in Roc Nation Sports. It signed Robinson Cano as its first baseball client in 2013.