Notable Thursday performances from prospects in the Rangers' minor league system.Triple-A Round Rock: RHP Nick Tepesch (4-2) went seven innings in a 4-1 win over Tacoma, giving up only a solo HR. CF Delino DeShields walked twice and scored two runs.Double-A Frisco: RF Preston Beck went 4 for 4 with a double and triple in a 3-1 loss to Tulsa.