Smart Fernandoes tend to mostly dive the enmy backline to distract and disrupt. When he dives th backline, this is your best opportunity to go for his backline and kill off his heavy damage dealers, especially while he regens with Last Stand.
No matter if enemy Fernando is an Aggressive Nando or a Defensive Nando, even one good Wrecker dealer can easily disrupt both of these strategies. You reduce his teamwork, self sustain and disrupt abilities.
if there is an Fernando with Aegis legendary in the other team and no hard hitter in your team, Wrecker is a must pick so you can deal with the shield.