Brown, the only coach to win both an NBA and an NCAA title, hadn't coached on the college level in 25 years until SMU won its season opener 73-58 over Loyola Marymount on Sunday.
TCU (2-1) played without junior forward Amric Fields, who was hurt only 12 seconds into the game when his right knee buckled awkwardly and he fell to the floor after taking a pass in the lane.
After Fields was helped off the court and to the locker room without putting any weight on his right leg, SMU scored the first five points and never trailed.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.