ERA+
Ron Mahay · Season-by-season history
ERA+ over time
- Boston Red Sox · MLB
- Athletics · MLB
- Texas Rangers · MLB
- Kansas City Royals · MLB
- Minnesota Twins · MLB
Hover over a bar for its value. Only numeric values with a recorded season are charted; missing seasons are not treated as zero.
| Season | Team | League | ERA+ |
|---|---|---|---|
| 2010 |  Minnesota Twins |
MLB | 119 |
| 2009 |  Kansas City Royals |
MLB | 93 |
| 2008 | Kansas City Royals |
MLB | 125 |
| 2007 |  Texas Rangers |
MLB | 166 |
| 2006 | Texas Rangers |
MLB | 117 |
| 2005 | Texas Rangers |
MLB | 68 |
| 2004 | Texas Rangers |
MLB | 197 |
| 2003 | Texas Rangers |
MLB | 159 |
| 2000 |  Athletics |
MLB | 53 |
| 1999 | Athletics |
MLB | 250 |
| 1998 |  Boston Red Sox |
MLB | 138 |
| 1997 | Boston Red Sox |
MLB | 187 |