The beloved 87 Twins, 05 Padres, 07 Arizona, 84 Royals, and the 97 Giants. made the playoffs with a negative run differential. Texas in 15 and 16 were very close to even. Less than 20 to the positive The 2014 Cards, also sneaked in. As the back end of rotations get worse it will be possible for good teams to have negative run differentials and still have some success in the playoffs.