qSeason Leaders by league, ERA
| Segcode |
Seg |
Lg |
SName |
Player |
Tm |
IP |
ER |
ERA |
| 0 | Lg | CFL | 2005 | HALLADAY,Roy | MEN | 161.2 | 38 | 2.12 |
| 0 | Lg | CFL | 2006 | SMOLTZ,John | ARR | 256.0 | 73 | 2.57 |
| 0 | Lg | CFL | 2007 | BEDARD,Erik | CNH | 209.0 | 47 | 2.02 |
| 0 | Lg | CFL | 2008 | LEE,Cliff | LS | 254.0 | 51 | 1.81 |
| 0 | Lg | CFL | 2009 | JURRJENS,Jair | MMW | 258.0 | 67 | 2.34 |
| 0 | Lg | CFL | 2010 | HERNANDEZ,Felix | SAT | 245.2 | 64 | 2.34 |
| 0 | Lg | CFL | 2011 | KERSHAW,Clayton | SYR | 266.0 | 72 | 2.44 |
| 0 | Lg | CFL | 2012 | GONZALEZ,Gio | SYR | 235.1 | 59 | 2.26 |
| 0 | Lg | CFL | 2013 | KERSHAW,Clayton | HTA | 268.1 | 51 | 1.71 |
| 0 | Lg | CFL | 2014 | KERSHAW,Clayton | HTA | 224.2 | 46 | 1.84 |
| 0 | Lg | CFL | 2015 | ARRIETA,Jake | NAP | 268.1 | 41 | 1.38 |
| 0 | Lg | CFL | 2016 | KERSHAW,Clayton | HTA | 170.0 | 31 | 1.64 |
| 0 | Lg | CFL | 2017 | STRASBURG,Stephen | SAT | 204.1 | 51 | 2.25 |
| 0 | Lg | CFL | 2018 | NOLA,Aaron | OMR | 242.1 | 51 | 1.89 |
| 0 | Lg | CFL | 2019 | ODORIZZI,Jake | LS | 186.0 | 61 | 2.95 |
| 0 | Lg | CFL | 2020 | KEUCHEL,Dallas | BEG | 208.1 | 52 | 2.25 |
| 0 | Lg | CFL | 2021 | STROMAN,Marcus | SAT | 201.2 | 58 | 2.59 |
| 0 | Lg | GSL | 2005 | CARPENTER,Chris | HWS | 233.1 | 54 | 2.08 |
| 0 | Lg | GSL | 2006 | SANTANA,Johan | ALR | 250.0 | 53 | 1.91 |
| 0 | Lg | GSL | 2007 | HUDSON,Tim | BAL | 245.0 | 58 | 2.13 |
| 0 | Lg | GSL | 2008 | SANTANA,Johan | HOO | 240.0 | 43 | 1.61 |
| 0 | Lg | GSL | 2009 | LILLY,Ted | GBH | 196.1 | 55 | 2.52 |
| 0 | Lg | GSL | 2010 | PRICE,David | HUM | 213.2 | 42 | 1.77 |
| 0 | Lg | GSL | 2011 | LEE,Cliff | CRC | 245.1 | 57 | 2.09 |
| 0 | Lg | GSL | 2012 | HAMELS,Cole | HOO | 233.1 | 49 | 1.89 |
| 0 | Lg | GSL | 2013 | HARVEY,Matt | JBE | 207.2 | 29 | 1.26 |
| 0 | Lg | GSL | 2014 | TEHERAN,Julio | HUM | 216.2 | 45 | 1.87 |
| 0 | Lg | GSL | 2015 | SCHERZER,Max | SES | 246.2 | 62 | 2.26 |
| 0 | Lg | GSL | 2016 | HAPP,J.A. | HUM | 228.1 | 46 | 1.81 |
| 0 | Lg | GSL | 2017 | CARRASCO,Carlos | MBS | 211.2 | 60 | 2.55 |
| 0 | Lg | GSL | 2018 | SYNDERGAARD,Noah | SFS | 191.0 | 46 | 2.17 |
| 0 | Lg | GSL | 2019 | COLE,Gerrit | SFS | 228.2 | 50 | 1.97 |
| 0 | Lg | GSL | 2020 | LAMET,Dinelson | MBS | 207.1 | 57 | 2.47 |
| 0 | Lg | GSL | 2021 | WEBB,Logan | COB | 168.0 | 38 | 2.04 |