Single-Season Losses
Leaderboard
 
* - Indicates Hall of Fame
Rank    Player Losses IP Year Career Leaderboard
1.    Walton Butterfield 26 201.3 2020  
2.    William Depaz 25 184.7 2013  
3.    Robert Marconi 24 177.3 2018  
  Aaron Cook 24 221.7 2014  
  Joseph Kissel 24 192.0 2014  
6.    Tyler Pelland 23 219.3 2010  
7.    Herman Yutzy 22 202.3 2019  
  Daryl Salls 22 186.0 2016  
  Horacio Ramirez 22 222.7 2012  
  Miguel Batista 22 210.7 2005  
11.    Howard Kapp 21 221.0 2019  
  Albert Zurita 21 176.0 2019  
  Carl Hiles 21 198.0 2018  
  Robert Benton 21 120.7 2013  
  Aaron Harang 21 174.3 2011  
  Mike Esposito 21 204.7 2009  
  Chad Billingsley 21 177.7 2009  
  Kyle Lohse 21 199.7 2007  
  Chin-Hui Tsao 21 193.7 2006  
20.    Fred McCree 20 202.3 2022  
  Juan Cain 20 212.0 2021  
  Derrick Logan 20 184.7 2021  
  Michael Rankin 20 204.0 2020  
  Albert Zurita 20 170.3 2020  
  Cecil Salas 20 204.0 2018  
  Daniel Ramirez 20 203.7 2018  
  Dustin McGowan 20 169.7 2017  
  Galen Merrick 20 224.7 2015  
  Pedro Cuevas 20 211.3 2015  
  Tomo Ohka 20 202.0 2014  
  Jesse Foppert 20 216.3 2013  
  Misao Tsurayaki 20 220.0 2012  
  Matt Lorenzo 20 196.0 2012  
  Jason Jennings 20 241.0 2006  
35.    David Martinez 19 274.7 2022  
  Jeremy Ronquillo 19 226.3 2022  
  Juan Moler 19 193.0 2021  
  Daniel Ramirez 19 163.3 2021  
  Oscar Devries 19 147.3 2019  
  Paul Ferreri 19 202.7 2018  
  Juan Cain 19 192.0 2018  
  Michael Boyer 19 171.7 2018  
  Fred McCree 19 182.7 2017  
  Floyd Caballero 19 174.3 2017  
  Robert Awad 19 230.0 2016  
  Matt Cain 19 212.3 2016  
  Joseph Kissel 19 160.3 2013  
  Jeff Allison 19 204.3 2012  
  Brad Penny 19 201.3 2010  
  Joel Hanrahan 19 213.7 2009  
  Mark Redman 19 197.3 2009  
  Woody Williams 19 202.0 2004  
53.    Dudley Johnson 18 205.7 2022  
  John Moore 18 220.7 2021  
  Jeremy Ronquillo 18 220.0 2021  
  Felix Hernandez 18 144.7 2021  
  Samuel Servantes 18 201.0 2020  
  Billy Evans 18 183.7 2020  
  Celestino Alvarez 18 172.7 2020  
  Mike Hinkley 18 149.0 2019  
  Christian Lundell 18 103.3 2018  
  Clint Everts 18 188.3 2017  
  Marcos Urbano 18 179.0 2017  
  Christian Lundell 18 179.7 2016  
  Boof Bonser 18 159.3 2016  
  Chris Young 18 189.3 2015  
  Matt Cain 18 180.3 2015  
  Francis Beltran 18 162.3 2015  
  Felton Allen 18 207.7 2014  
  Matt Cain 18 190.3 2014  
  Horacio Ramirez 18 208.3 2013  
  Chadd Blasko 18 156.0 2012  
  Ben Howard 18 193.7 2011  
  Matt Cain 18 225.0 2010  
  Miguel Asencio 18 215.0 2010  
  Glendon Rusch 18 196.7 2010  
  Travis Blackley 18 240.0 2009  
  Kerry Wood 18 229.7 2009  
  Nadimu Haruki 18 206.7 2009  
  Ian Oquendo 18 203.7 2009  
  Brian Lawrence 18 200.3 2008  
  Lance Cormier 18 165.0 2008  
  Joel Pineiro 18 222.0 2007  
  Kerry Wood 18 206.0 2007  
  Livan Hernandez 18 186.0 2006  
  Danny Haren 18 166.3 2006  
  Jorge Depaula 18 141.3 2005  
88.    Martin Straub 17 231.3 2022  
  Wilmer Heywood 17 205.7 2022  
  Juan Moler 17 166.7 2022  
  Jeffery Oliveros 17 212.3 2021  
  Elliott Knowles 17 200.3 2021  
  Justin Phillips 17 183.7 2021  
  Faustino Fusco 17 221.3 2020  
  Juan Moler 17 211.7 2020  
  Robert Falcone 17 177.7 2020  
  Daniel Ramirez 17 208.3 2019  
  Anthony Rikyu 17 192.7 2019  
  Carl Hiles 17 110.7 2019  
  Glen Rakestraw 17 195.7 2018