The African Heritage Cultural Arts Center presents “The Opponent,” written by Brett Neveu. Directed by Lowell Williams, “The Opponent” looks at the hardscrabble world of boxing from the perspective of a small-time boxing gym owner, the seen-it-all-and-then-some Tremont “Tre” Billiford (Enrique Galan), and a young up-and-comer, Donell Fuseles (Kedar Myers).