The Cal Poly Mustangs dropped their series finale with UC Riverside Sunday at home, 6-3.
With the loss, the Mustangs and Highlanders split their series at two games a piece.
Cal Poly allowed three runs to open the ballgame in the 3rd inning.
Nick Marinconz homered to put the Mustangs on the board in the 5th inning, trailing 4-1.
The Mustangs crossed the plate twice in the 8th inning on an RBI base hit by Marinconz and on a wild pitch.
Riverside would put the game away with an RBI base hit off the bat of Nathan Webb in the 9th inning.
The Mustangs fall to 19-17 on the season.
Cal Poly drops to 9-11 in Big West Conference play.
Cal Poly will head to UCSB next weekend.