| Career - Worst WHIP | |||
| Rk | Player Name | Totals | |
| 1 | Brian Holman | 1.70 | |
| 2 | Pat Rapp | 1.63 | |
| 3 | Aaron Harang | 1.60 | |
| 4 | Kevin Appier | 1.55 | |
| 5 | Charlie Hough | 1.53 | |
| 6 | Mark Langston | 1.52 | |
| 7 | Chuck Finley | 1.50 | |
| 8 | Alex Wood | 1.47 | |
| 9 | Andy Pettitte | 1.46 | |
| 10 | Robbie Ray | 1.46 | |
| 11 | Armando Reynoso | 1.45 | |
| 12 | Zack Greinke | 1.45 | |
| 13 | Mike Moore | 1.43 | |
| 14 | Mike Remlinger | 1.43 | |
| 15 | Jason Schmidt | 1.42 | |
| 16 | Pedro Astacio | 1.41 | |
| 17 | Kyle Gibson | 1.41 | |
| 18 | Chris Carpenter | 1.38 | |
| 19 | Shaun Marcum | 1.35 | |
| 20 | Madison Bumgarner | 1.33 | |
| 21 | Steve Reed | 1.32 | |
| 22 | Carlos Rodon | 1.25 | |
| 23 | Randy Johnson | 1.17 | |
| 24 | Curt Schilling | 1.17 | |
| 25 | Max Scherzer | 1.17 | |
| Single Season - Worst WHIP | |||||
| Rk | Player Name | Totals | Year | ||
| 1 | Mark Langston | 1.89 | 1991 | ||
| 2 | Fernando Valenzuela | 1.89 | 1990 | ||
| 3 | Charlie Hough | 1.84 | 1991 | ||
| 4 | Mark Langston | 1.78 | 1995 | ||
| 5 | Aaron Cook | 1.78 | 2011 | ||
| 6 | Mike Moore | 1.77 | 1991 | ||
| 7 | Bobby Ojeda | 1.76 | 1990 | ||
| 8 | Brian Holman | 1.71 | 1990 | ||
| 9 | Brian Holman | 1.69 | 1991 | ||
| 10 | Kevin Appier | 1.64 | 2001 | ||
| 11 | Chuck Finley | 1.64 | 1998 | ||
| 12 | Kyle Gibson | 1.64 | 2024 | ||
| 13 | Mark Hendrickson | 1.62 | 2007 | ||
| 14 | Mark Langston | 1.61 | 1990 | ||
| 15 | Chuck Finley | 1.60 | 1995 | ||
| 16 | Russ Ortiz | 1.59 | 2000 | ||
| 17 | Chuck Finley | 1.58 | 1994 | ||
| 18 | Greg W. Harris | 1.58 | 1994 | ||
| 19 | Scott Erickson | 1.57 | 2000 | ||
| 20 | Patrick Sandoval | 1.57 | 2023 | ||
| 21 | Alex Wood | 1.56 | 2018 | ||
| 22 | Bobby J. Jones | 1.55 | 1997 | ||
| 23 | Omar Olivares | 1.55 | 1997 | ||
| 24 | Zack Greinke | 1.55 | 2009 | ||
| 25 | Hyun-Jin Ryu | 1.55 | 2015 | ||