The Saints only got one hit off Savacool's pitching.
Costes launched his seventh homer of the season to boost the Terps toward a second victory over the Hoyas.
The Terps were unable to quell the Pirates after stranding multiple runners in pivotal moments in the game.
The Terps scored three runs in the fourth inning to reinsert themselves into the game, and quickly pulled away soon after.
The Terps will have a 2021 Greenville Regional rematch with East Carolina along with their first matchup against Michigan over the weekend.
The Terps' Nick Dean, Jason Savacool and Ryan Ramsey have been dominant to start the season.
The Terps reached 7-0 for the first time in program history, beating the Camels three times in the span of two days to remain undefeated on the season.
The Terps' sweep of the Bears was their first road sweep under coach Rob Vaughn.
The Terps were at a deficit for the first time this season but home runs from Max Costes and Matt Shaw pushed them to 3-0.
The Terps will open their season with a challenge at Baylor.