Get a free sub from Firehouse Subs when MLB games go into extra innings. Heres how.

Firehouse Subs just became the Official Sub of Major League Baseball, which means two things. First, you'll likely start seeing more Firehouse Subs logos while you're watching baseball games and, more importantly, you can score free subs.To celebrate the brands' first national sports league deal in its 31-year history, as well as the start of the back half of baseball season, Firehouse Subs is launching a season-long "Extra Innings, Extra Subs" promotion. Starting Friday, July 17, fans can buy a