UCLA is eliminated and finishes the season with an overall record of 45-16.
Kevin Kramer, Darrell Miller Jr. and Ty Moore combined for eight hits in the win.
A pair of home runs helped propel the Bruins to a crucial victory over the Roadrunners.
Watson strikes out six, but the Bruins are forced to face elimination tomorrow versus Bakersfield.
The Bruins scored in six consecutive innings to take down the Roadrunners.