Just last year, the Rockies’ bullpen ranked in baseball’s bottom third, coming in 21st in baseball with a 2.2 fWAR. So far this year, their relievers are the best in the game using that same metric, with a 1.4 fWAR and a 2.80 ERA that’s remarkable considering the context in which they pitch. The Denver Post’s Nick Groke explains the bullpen’s transformation, beginning with the signings of Greg Holland and Mike Dunn last winter. “Greg Holland and Mike Dunn have been fabulous for the mentality of the bullpen,” says manager Bud Black.