| Career - Worst WHIP | |||
| Rk | Player Name | Totals | |
| 1 | Joe Magrane | 1.58 | |
| 2 | Greg Maddux | 1.53 | |
| 3 | Randy Johnson | 1.49 | |
| 4 | Pat Hentgen | 1.48 | |
| 5 | Tim Hudson | 1.47 | |
| 6 | Javier Vazquez | 1.45 | |
| 7 | Jack Morris | 1.44 | |
| 8 | Brad Keller | 1.44 | |
| 9 | Mark Gardner | 1.42 | |
| 10 | Alex Cobb | 1.41 | |
| 11 | Mark Portugal | 1.40 | |
| 12 | Felix Hernandez | 1.40 | |
| 13 | Kevin Brown | 1.37 | |
| 14 | Chris Young | 1.37 | |
| 15 | Paul Maholm | 1.37 | |
| 16 | Chien-Ming Wang | 1.36 | |
| 17 | Orlando Hernandez | 1.35 | |
| 18 | Francisco Cordova | 1.33 | |
| 19 | Livan Hernandez | 1.33 | |
| 20 | Brandon McCarthy | 1.33 | |
| 21 | Tanner Houck | 1.32 | |
| 22 | John Lackey | 1.30 | |
| 23 | John Smiley | 1.29 | |
| 24 | David Wells | 1.28 | |
| 25 | Jesse Hahn | 1.23 | |
| Single Season - Worst WHIP | |||||
| Rk | Player Name | Totals | Year | ||
| 1 | Jamie Moyer | 1.82 | 1994 | ||
| 2 | Pat Hentgen | 1.81 | 1994 | ||
| 3 | Mark Portugal | 1.79 | 1994 | ||
| 4 | Javier Vazquez | 1.77 | 2001 | ||
| 5 | Kirk Rueter | 1.69 | 1994 | ||
| 6 | Anibal Sanchez | 1.68 | 2011 | ||
| 7 | Sterling Hitchcock | 1.67 | 2000 | ||
| 8 | Joe Magrane | 1.67 | 1991 | ||
| 9 | Jack Morris | 1.66 | 1991 | ||
| 10 | Roger Bailey | 1.63 | 1997 | ||
| 11 | Mark Portugal | 1.58 | 1995 | ||
| 12 | Tim Wakefield | 1.58 | 2002 | ||
| 13 | Randy Johnson | 1.57 | 1991 | ||
| 14 | Mark Gubicza | 1.56 | 1990 | ||
| 15 | Armando Reynoso | 1.56 | 2000 | ||
| 16 | Kenny Rogers | 1.55 | 2001 | ||
| 17 | Johan Oviedo | 1.54 | 2023 | ||
| 18 | Shawn Boskie | 1.53 | 1997 | ||
| 19 | Chris Volstad | 1.53 | 2009 | ||
| 20 | John Cerutti | 1.51 | 1990 | ||
| 21 | C.C. Sabathia | 1.51 | 2012 | ||
| 22 | Mike Foltynewicz | 1.50 | 2020 | ||
| 23 | Joe Magrane | 1.49 | 1990 | ||
| 24 | Greg Maddux | 1.49 | 2008 | ||
| 25 | Jason Marquis | 1.49 | 2010 | ||