ERA+
Willis Roberts · Season-by-season history
ERA+ over time
- Detroit Tigers · MLB
- Baltimore Orioles · MLB
| Season | Team | League | ERA+ |
|---|---|---|---|
| 2003 |  Baltimore Orioles |
MLB | 79 |
| 2002 | Baltimore Orioles |
MLB | 128 |
| 2001 | Baltimore Orioles |
MLB | 88 |
| 1999 |  Detroit Tigers |
MLB | 45 |