San Francisco Giants Core Four: A Retrospective

The San Francisco Giants have won three World Series since moving to the city in 1958. Each and every championship included four relief pitchers better known as “The Core Four.” Jeremy Affeldt, Sergio Romo, Santiago Casilla and Javier Lopez. With Affeldt’s retirement at the end of the 2015 season and the pending free agency of Romo, Casilla and Lopez, we may have seen the last of the strongest bullpen in Giants history.

Since the 2010 trade deadline, when the San Francisco Giants acquired Lopez from the Pittsburgh Pirates, these four pitchers have been literal Giants. They have been the core of a bullpen that consistently stopped some of the best lineups in baseball. Affeldt’s scoreless…