Single-Season Walks per 9IP
Leaderboard
 
* - Indicates Hall of Fame
Rank    Player Walks per 9IP IP Year Career Leaderboard
1.    Roy Halladay 0.56 240.7 2008  
2.    Roy Halladay 0.57 268.7 2010  
3.    Danny Haren 0.64 224.3 2012  
4.    J.D. Martin 0.68 212.7 2013  
5.    Daniel Scott 0.69 235.3 2016  
6.    Roy Halladay 0.72 275.0 2009  
7.    Mark Prior * 0.73 185.7 2015  
8.    Danny Haren 0.76 177.3 2016  
9.    Marvin Young 0.80 225.0 2019  
10.    Joseph Chandler 0.81 222.3 2020  
11.    Mark Prior * 0.81 244.3 2011  
12.    Danny Haren 0.81 232.3 2010  
13.    Roy Halladay 0.82 264.7 2011  
14.    Mark Prior * 0.83 238.7 2008  
15.    J.D. Martin 0.83 226.7 2015  
16.    Mark Prior * 0.84 279.3 2009  
17.    Glen Rakestraw 0.85 223.7 2013  
18.    Korey Mathison 0.85 287.3 2022  
19.    Korey Mathison 0.85 286.3 2020  
20.    Thomas Gries 0.88 215.0 2017  
21.    J.D. Martin 0.88 245.0 2010  
22.    Danny Haren 0.89 203.3 2013  
23.    Thomas Finch 0.89 223.0 2021  
24.    Daniel Scott 0.89 243.0 2015  
25.    Joe Kennedy 0.90 189.3 2012  
26.    Jeffery Oliveros 0.90 209.0 2022  
27.    Thomas Finch 0.91 218.7 2022  
28.    Brian Tiger 0.91 208.7 2018  
29.    Brian Tiger 0.92 206.3 2021  
30.    Juan Moler 0.92 166.7 2022  
31.    Jeffery Oliveros 0.92 205.3 2020  
32.    Javier Vazquez 0.93 271.3 2007  
33.    Kevin Rockey 0.93 174.3 2017  
34.    Travis Blackley 0.93 222.0 2008  
35.    Korey Mathison 0.94 231.0 2018  
36.    Joe Kennedy 0.94 210.7 2013  
37.    Joe Kennedy 0.94 239.0 2009  
38.    J.D. Martin 0.95 219.0 2014  
39.    Glen Rakestraw 0.97 231.0 2012  
40.    Mark Prior * 0.98 203.0 2012  
41.    Korey Mathison 0.99 290.7 2021  
42.    Javier Vazquez 0.99 172.3 2012  
43.    Dennis Baley 0.99 253.7 2022  
44.    Mark Prior * 1.00 260.3 2010  
45.    Javier Vazquez 1.03 280.7 2009  
46.    Joe Kennedy 1.03 201.3 2014  
47.    Joseph Chandler 1.03 201.0 2021  
48.    J.D. Martin 1.03 209.7 2016  
49.    J.D. Martin 1.04 233.7 2012  
50.    Mark Prior * 1.04 268.0 2007  
51.    Danny Haren 1.04 215.7 2011  
52.    Roger Heitman 1.05 266.3 2012  
53.    Jeffery Oliveros 1.05 171.3 2018  
54.    J.D. Martin 1.05 231.0 2018  
55.    Rex Martinez 1.07 177.0 2022  
56.    Daniel Scott 1.07 168.3 2018  
57.    Roy Halladay 1.07 243.3 2007  
58.    Daniel Scott 1.08 207.7 2014  
59.    Dennis Baley 1.08 240.7 2021  
60.    Jeremy Bonderman 1.09 238.7 2012  
61.    Daniel Scott 1.09 246.7 2017  
62.    Joe Kennedy 1.10 213.7 2010  
63.    Adam Muniz 1.10 212.0 2017  
64.    Danny Haren 1.10 203.7 2015  
65.    Mark Prior * 1.11 252.3 2013  
66.    Chad Iliff 1.11 186.7 2017  
67.    Martin Straub 1.11 210.7 2020  
68.    John Moore 1.11 226.7 2014  
69.    J.D. Martin 1.11 242.7 2011  
70.    Freddie Cooley 1.12 257.3 2016  
71.    Thomas Gries 1.13 198.3 2013  
72.    Marvin Young 1.14 213.3 2017  
73.    Joe Kennedy 1.14 173.7 2011  
74.    Javier Vazquez 1.15 212.0 2010  
75.    Thomas Gries 1.15 211.0 2019  
76.    Roger Heitman 1.16 249.0 2013  
77.    J.D. Martin 1.16 224.3 2017  
78.    Glen Rakestraw 1.16 239.7 2010  
79.    Steven Maney 1.17 215.7 2016  
80.    Daniel Scott 1.17 238.7 2019  
81.    Adam Muniz 1.19 212.3 2020  
82.    Kevin Rockey 1.19 219.0 2018  
83.    Nicholas Lehr 1.19 226.0 2012  
84.    Juan Moler 1.21 193.0 2021  
85.    Thomas Gries 1.21 222.3 2018  
86.    Kyle Snyder 1.22 207.3 2007  
87.    Danny Haren 1.23 175.3 2017  
88.    Jeremy Bonderman 1.24 231.7 2007  
89.    Martin Straub 1.25 231.0 2021  
90.    Glen Rakestraw 1.25 230.7 2014  
91.    Byron Abella 1.25 223.0 2021  
92.    Ricardo Rodriguez 1.27 163.3 2008  
93.    Brad Radke 1.27 227.0 2005  
94.    John Moore 1.27 233.7 2015  
95.    Dennis Baley 1.27 247.7 2020  
96.    Glen Rakestraw 1.27 198.0 2011  
97.    Joe Kennedy 1.27 226.0 2008  
98.    J.D. Martin 1.28 218.0 2008  
99.    John Moore 1.28 182.7 2016  
100.    Matt Capps 1.28 231.7 2010