TRYOUTS FOR HIGH SCHOOL BASEBALL PLAYERS 15U, 16U, 17U, 18U. The McKinney Marshals, with teams located across the DFW area, are holding tryouts to fill out our rosters. Our next tryout is this weekend. You must register for a tryout at www.mckinneymarshals.com to receive time and location, or call 972-841-3744. 19+ COLLEGE PLAYERS: Register now to be considered for our invite-only Five Tool Collegiate League teams, or call 972-841-3744.