While Willie Hernandez’s 1984 season was awe-inspiring, and deserves to be placed on a pedestal somewhere, I don’t think it is the greatest single season by a lefty closer. Consider Billy Wagner’s 1999 numbers: 74.7 IP 35 H 23 BB 13 ER (!) 124 SO (!!) 1.57 ERA 39 Saves Here are the same numbers…