Vaughn's contract came into effect July 2020 and will run through June 2026, securing the head coach that brought the Terps to the NCAA tournament for the first time since 2017.
The Terps made their first NCAA tournament appearance since 2017 and established what could become the new culture for Maryland baseball.
The Scarlet Knights combined for 17 runs and 21 hits across Saturday's doubleheader.
The Terps fought their way out of a 3-0 hole.
The Patriots issued 14 walks, hit four batters and threw three wild pitches.
A costly error in the seventh inning by left fielder Troy Schreffler helped the Rams pull away.
The Terps were behind 2-0 entering the ninth inning.
Dean struck out six and allowed two earned runs over 4 2/3 innings.
Sean Fisher struck out five in 5.1 innings in his first career start.
The Terps open the season Friday against Charleston Southern.