(Berkeley, CA)  --  Oregon State begins Pac-12 baseball play today at California.  The Beavers are ranked number-one nationally with a 15-and-1 record.  They ran away with the Pac-12 title last year with a 27-and-3 record.  All-American second baseman Nick Madrigal is out with a left wrist injury.  He is expected to miss four-to-six weeks.