The Terps beat the Rams for the third time this season.
Ridge Winand hit two home runs for the Buckeyes.
The Terps combined for 36 hits between both games.
The Terps fell behind in the first inning for the fourth straight game.
Right-hander Sean Heine was tagged for five runs in the first inning.
It's the third time Costes has earned the award this season.
Maxwell Costes and Justin Vought each clubbed three RBIs.
Coach Rob Vaughn was ejected for protesting the Wildcats' go-ahead run in the eighth.
The Terps issued 12 walks.
Justin Vought launched a grand slam as part of a seven-run fifth inning.