Single-Season Leaders for ERA
Minimum of 3.1 PA/G, 1.0 IP/G, and 0.1 decision/G for single-season leaderboards for rate statistics.
| Rank | Player | ERA | Year |
| 1. | Pedro Martinez | 1.79 | 2001 |
| 1. | Felix Hernandez | 1.79 | 2011 |
| 3. | Clayton Kershaw | 1.91 | 2012 |
| 4. | Jair Jurrjens | 2.27 | 2010 |
| 5. | Justin Verlander | 2.41 | 2012 |
