Johnston scored the game winner against USF.
Midfielder Malcolm Johnston scored the lone goal.
Brown is adjusting to a new school and a new position.
Coach Sasho Cirovski believes another challenging slate could lead to a second straight national championship.
The Terps are ranked No. 1 in the country by the United States Soccer Coaches' preseason poll despite their conference ranking.
The Terps will be without a number of their top goalscorers from 2018.