The Pilots received a number one seed and play at home against University of Texas San Antonio. They play after an Oklahoma versus Washington match at 4:30.
Tickets go on sale Wednesday at 11 a.m. through Ticketmaster outlets or by calling (800) 745-3000 or in-person at the Pilot Box Office. Prices are $9 for adult bleacher seating and $5 for youth bleacher seating. Stadium chairs are $14 and bench backs are $12.
The match will also be streamed live at portlandpilots.com.
Winners advance to a Sunday round two at 1 p.m. at Merlo Field. The Pilots have won 35 times straight at home, the nation's longest win streak.
The Beavers were awarded an at-large berth in the seventh-round of an eight-round selection aired Monday on ESPNU.
Oregon State finished with a program best record of 15-3-1 overall and 7-2-0 in Pacific-10 Conference play. They had been ranked 13th in the country before a loss Sunday to Cal.
If they win, Oregon State advances to the second round Sunday and play the winner of the Oklahoma State and Michigan match.