A costly error in the seventh inning by left fielder Troy Schreffler helped the Rams pull away.
Sean Fisher went 6 ⅓ innings, striking out four and walking one.
The Terps started 3-0, including a win over College of Charleston.
Flint leads the team through three games with six hits.
The Terps started two first-year pitchers during the first weekend of the season.
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.
The No. 3 jersey symbolizes the Terps' three pillars of success.
Right-hander Elliot Zoellner pitched 3 1/3 scoreless innings of relief, but the Terps faltered late.