| Career - Worst WHIP | |||
| Rk | Player Name | Totals | |
| 1 | Tom Browning | 1.64 | |
| 2 | Randy Wolf | 1.63 | |
| 3 | Jose Mesa | 1.62 | |
| 4 | Blake Snell | 1.54 | |
| 5 | Tyler Alexander | 1.49 | |
| 6 | A.J. Burnett | 1.47 | |
| 7 | Dave Stieb | 1.47 | |
| 8 | Tim Lincecum | 1.46 | |
| 9 | Lance Lynn | 1.43 | |
| 10 | Roger Clemens | 1.42 | |
| 11 | Kevin Tapani | 1.42 | |
| 12 | Joaquin Benoit | 1.41 | |
| 13 | Roy Oswalt | 1.41 | |
| 14 | Jose Quintana | 1.39 | |
| 15 | Zane Smith | 1.36 | |
| 16 | Paul Abbott | 1.35 | |
| 17 | Tim Wakefield | 1.35 | |
| 18 | Logan Gilbert | 1.35 | |
| 19 | Kevin Appier | 1.33 | |
| 20 | Kevin Brown | 1.31 | |
| 21 | Josh Collmenter | 1.25 | |
| 22 | Miguel Gonzalez | 1.22 | |
| 23 | Scott Downs | 1.20 | |
| 24 | Daniel Hudson | 1.18 | |
| 25 | Jose Fernandez | 1.18 | |
| Single Season - Worst WHIP | |||||
| Rk | Player Name | Totals | Year | ||
| 1 | Jose Mesa | 2.02 | 1994 | ||
| 2 | Randy Wolf | 1.99 | 2001 | ||
| 3 | Dave Stewart | 1.90 | 1994 | ||
| 4 | Victor Zambrano | 1.87 | 2004 | ||
| 5 | Blake Snell | 1.80 | 2018 | ||
| 6 | Mike Moore | 1.77 | 1994 | ||
| 7 | Erik Hanson | 1.68 | 1997 | ||
| 8 | Paul Abbott | 1.66 | 2001 | ||
| 9 | Tom Browning | 1.66 | 1991 | ||
| 10 | Hideo Nomo | 1.65 | 1998 | ||
| 11 | Rob Bell | 1.65 | 2005 | ||
| 12 | Tom Browning | 1.64 | 1990 | ||
| 13 | Randy Wolf | 1.64 | 2005 | ||
| 14 | Tom Gorzelanny | 1.63 | 2008 | ||
| 15 | R.A. Dickey | 1.63 | 2018 | ||
| 16 | Kevin Brown | 1.62 | 1994 | ||
| 17 | Matt Garza | 1.62 | 2017 | ||
| 18 | Adbert Alzolay | 1.62 | 2022 | ||
| 19 | Omar Daal | 1.61 | 2000 | ||
| 20 | Roy Oswalt | 1.60 | 2008 | ||
| 21 | Kevin Appier | 1.58 | 1994 | ||
| 22 | Roy Oswalt | 1.58 | 2005 | ||
| 23 | A.J. Burnett | 1.58 | 2011 | ||
| 24 | Jered Weaver | 1.57 | 2016 | ||
| 25 | Tim Wakefield | 1.56 | 1997 | ||