On December 15, 1982, in his fifth game as coach Tapscott guided the Eagles to a 62–61 upset over its cross-town rival Georgetown who were led by Patrick Ewing and ranked fifth in the nation.

[6] Tapscott almost scored another upset over a highly ranked Georgetown four years later but the Reggie Williams-led Hoyas held on 62–59 and Coach John Thompson dropped American University from its schedule thereafter.

On November 24, 2008, Tapscott, at that time director of player development, was named as interim head coach, replacing Eddie Jordan after a dismal 1–10 start during the season.

[8] Tapscott made his professional coaching debut against the Golden State Warriors on November 25, 2008, a game which resulted in a win.

[9] After Flip Saunders was hired as coach of the Wizards, Tapscott returned to his position as the team's director of player development.