Reyne Smith finished with 18 points for the Cougars (4-2), Meeks and Underwood each scored 12 and Fah'mir Ali 10.
Silvio De Sousa scored a career-high 21 points and had three blocks for the Mocs (5-1) whose five-game win streak came to an end. David Jean-Baptiste added 18 points and seven rebounds and Darius Banks scored 11.
Malachi Smith, who led the Mocs in scoring coming into the matchup with 16 points per game, finished 2-for-11 shooting and scored five points.
Portland State takes on Southern Utah, looks to end 4-game slide
Southern Utah Thunderbirds (11-6, 5-2 Big Sky) at Portland State Vikings (4-12, 2-6 Big Sky)
Montana State hosts Eastern Washington after Venters' 21-point game
Eastern Washington Eagles (11-8, 5-3 Big Sky) at Montana State Bobcats (14-5, 6-2 Big Sky)
Milstead leads CSU Fullerton against UC Davis after 20-point game
CSU Fullerton Titans (11-5, 4-0 Big West) at UC Davis Aggies (8-5, 1-1 Big West)