Regular season statistics only, updated through the conclusion of the 2024 season.
* Denotes record set in a 42-game season.
N.B. Intercounty Records are divided into two eras, in the Post War Era (1946-1957) teams played up to a 60-game schedule, while in the Modern Era (1958-Present) the longest schedule has traditionally been only 36 games.
In 2013, and from 2022 to today, teams have played 42-game seasons. Also, there are no official statistics available from the post-WWII era, while the Modern Era is complete.
IBL SINGLE SEASON PITCHING RECORDS
Most Appearances
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| Bob Johnstone
| 1970 | Toronto | 26 |
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Most Wins |
| Wallace "Spud" Bush | 1961 | Brantford | 16 |
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Most Loses |
| Greg Kingdon | 1965 | Listowel | 11 |
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Most Saves | * | Deivy Mendez | 2024 | Welland | 12 |
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| Kyle Payne | 2008 | Barrie | 11 |
| * | Deivy Mendez | 2023 | Welland | 10 |
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| Enerio Del Rosario | 2017 | Barrie | 9 |
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| Miguel Lahera | 2018 | Kitchener | 8 |
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Most Complete Games |
| Wallace "Spud" Bush | 1961 | Brantford | 15 |
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Best Won-Lost Percentage | * | Claudio Custodio (11-0) | 2022 | Guelph | 1.000 |
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| Marshall Gates (11-0) | 1973 | Toronto | 1.000 |
| * | Owen Boon (10-0) | 2022 | London | 1.000 |
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| Jeff Jens (10-0) | 1978 | Stratford | 1.000 |
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| Emilis Guerrero (9-0) | 2017 | Barrie | 1.000 |
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| Mark Fraser (9-0) | 1995 | Stratford | 1.000 |
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| Craig Kennedy (9-0) | 1976 | Brantford | 1.000 |
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| Mike Kilkenny (9-0) | 1975 | London | 1.000 |
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Lowest Earned Run Average (45 IP Min.) |
| Bob Bodden | 1975 | Brantford | 0.29 |
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| Frank Garces | 2018 | Barrie | 0.38 |
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| Stefan Strecker | 2009 | Brantford | 0.79 |
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| Scott Medvin | 1998 | Kitchener | 0.86 |
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| Brian Murphy | 1968 | London | 0.93 |
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Most Innings Pitched |
| Ron Stead | 1960 | Brantford | 149 |
| * | Claudio Custodio | 2022 | Guelph | 120 |
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Most Batters Faced |
| Bob Lory | 1978 | St. Thomas | 622 |
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Most Hits Allowed |
| J.P. Groulx | 1985 | Brantford | 151 |
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| Bob Lory | 1978 | St.Thomas | 151 |
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Most Runs Allowed |
| Harry Costello | 1988 | Hamilton | 101 |
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Most Earned Runs Allowed |
| Harry Costello | 1988 | Hamilton | 78 |
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| Mark Jeans | 1986 | Hamilton | 78 |
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Most Home Runs Allowed |
| Keith Johns | 1993 | St. Thomas | 19 |
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Most Bases On Balls Issued |
| Mark Jeans | 1987 | Hamilton | 87 |
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Most Strikeouts | * | Claudio Custodio | 2022 | Guelph | 196 |
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| Ron Stead | 1965 | Brantford | 155 |
| * | Jose Arias | 2022 | London | 132 |
| * | Owen Boon | 2022 | London | 111 |
| * | Cesar Rosado | 2024 | Barrie | 105 |
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Most Hit Batters |
| Cory Hammond | 2008 | Stratford | 16 |
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| Roy McKay | 1958 | London | 16 |
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Most Wild Pitches |
| Dwight Griese | 1982 | Guelph | 32 |