First pitch is set for 4:30 p.m. at Baylor on Friday.
Mathias was impressive during his audition for Team USA, going 12 for 26 (.462) with nine runs scored and four stolen bases.
The top-seeded Mustangs (45-10), hosting an NCAA Regional for the first time in school history, will square off against No. 4 Sacramento State at 6 p.m. on Friday.
Cal Poly baseball will host Arizona State, Pepperdine and Sacramento State in the San Luis Obispo Regional starting Friday.
The Cal Poly baseball team ended its longest losing streak of the season with a 7-5 triumph at UC Riverside on Saturday night.
Despite the return of its top hitter, the No. 3 Cal Poly baseball team suffered its fourth straight loss.
Chris Hoo’s walk-off single propelled Cal Poly to an 8-7 win over UCSB in game 2 of a three-game set on Saturday night.