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In his first career start, freshman pitcher Matt Arens held the Roadrunners scoreless through the first three innings.
The Cal Poly baseball team took both of their games against Pacific Saturday, but lost Friday and Sunday.
Cal Poly had more hits than San Jose State, but stranded a dozen runners on base.
The Mustangs went 1-3 in their opening tournament, facing Gonzaga twice, New Mexico and Oregon State.