- Jim Clancy has the most losses of any Toronto Blue Jays pitcher.
- Clancy had nine seasons with 11 or more losses as a Jay.
- Only two Jays pitchers have amassed more than 85 losses.
Ranking among the most losses in Toronto Blue Jays history doesn’t mean a pitcher was terrible. In fact, a pitcher has to have been durable to have recorded a high number of losses and performed to a high enough standard to keep their place on the roster.
Pitching wins and losses are heavily influenced by the performance of the team. Those who played for the franchise when Blue Jays odds had them as outsiders to win the division were likely to lose more games due to a lack of run support.
Losses are inevitable for starting pitchers, meaning even those priced among the sportsbook favourites for the Cy Young will collect plenty of losses over the years.
Most All-Time Losses By a Blue Jays Pitcher
| Rank | Player | Losses | Blue Jays Years |
| 1 | Jim Clancy | 140 | 1977-88 |
| 2 | Dave Stieb | 134 | 1979-92, 1998 |
| 3 | Pat Hentgen | 85 | 1991-99, 2004 |
| 4 | Jimmy Key | 81 | 1984-92 |
| 5 | Roy Halladay | 76 | 1998-2009 |
| 6 | Todd Stottlemyre | 70 | 1988-94 |
| 7 | Juan Guzman | 62 | 1991-98 |
| 8 | Luis Leal | 58 | 1980-85 |
| 9 | Jesse Jefferson | 56 | 1977-80 |
| T-10 | Kelvim Escobar | 55 | 1997-2003 |
| T-10 | David Wells | 55 | 1987-92, 1999-2000 |
Which Blue Jays Pitcher Has the Most Losses in Team History?
Jim Clancy has the most losses of any Blue Jays pitcher, with 140. Clancy has six more losses than second-placed Dave Stieb and 55 more than third-placed Pat Hentgen.
Roy Halladay, a perennial Cy Young favourite in baseball odds, slots fifth with 76 losses but never had more than 11 in a single season.
Despite losing 85 games as a Jay, Hentgen only had two seasons with a losing record prior to going 2-9 with a 6.95 ERA in 2004.
Jerry Garvin, Phil Huffman, and Jimmy Key are tied for the most losses in a season, with 18 in 1977, 1979, and 1986, respectively. Jesse Jefferson and Dave Stieb share the record for the most home losses in a season, with 10 apiece in 1977 and 1980, respectively.
