ERA
Roberto Hernández · Season-by-season history
ERA over time
- Chicago White Sox · MLB
- Tampa Bay Rays · MLB
- Kansas City Royals · MLB
- Cleveland Guardians · MLB
- Houston Astros · MLB
| Season | Team | League | ERA |
|---|---|---|---|
| 2015 |  Houston Astros |
MLB | 4.36 |
| 2013 |  Tampa Bay Rays |
MLB | 4.89 |
| 2012 |  Cleveland Guardians |
MLB | 7.53 |
| 2011 | Cleveland Guardians |
MLB | 5.25 |
| 2010 | Cleveland Guardians |
MLB | 3.77 |
| 2009 | Cleveland Guardians |
MLB | 6.32 |
| 2008 | Cleveland Guardians |
MLB | 5.44 |
| 2007 | Cleveland Guardians |
MLB | 3.06 |
| 2006 | Cleveland Guardians |
MLB | 5.42 |
| 2002 |  Kansas City Royals |
MLB | 4.33 |
| 2001 | Kansas City Royals |
MLB | 4.12 |
| 2000 | Tampa Bay Rays |
MLB | 3.19 |
| 1999 | Tampa Bay Rays |
MLB | 3.07 |
| 1998 | Tampa Bay Rays |
MLB | 4.04 |
| 1997 |  Chicago White Sox |
MLB | 2.44 |
| 1996 | Chicago White Sox |
MLB | 1.91 |
| 1995 | Chicago White Sox |
MLB | 3.92 |
| 1994 | Chicago White Sox |
MLB | 4.91 |
| 1993 | Chicago White Sox |
MLB | 2.29 |
| 1992 | Chicago White Sox |
MLB | 1.65 |
| 1991 | Chicago White Sox |
MLB | 7.80 |