MONTREAL — Groupe Yvon Michel (GYM) is presenting an evening of thunder, “Collision: Stevenson vs. Fonfara,” May 24 at Bell Centre in Montreal. The co-feature will mark the SHOWTIME debut of powerful Quebec middleweight David Lemieux (31-2-0, 29 KOs), who takes on Dominican Republic-born, American fighterFernando Guerrero (26-2-0, 19 KOs) for the vacant NABF title.