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| Single-Season Winning Pct Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Winning Pct | IP | Year | Career Leaderboard |
| 1. | Juan Marichal * | .9600 | 254.7 | 1971 | |
| 2. | Seth Morehead | .9375 | 126.3 | 1968 | |
| 3. | Jose Deleon | .8947 | 189.3 | 1989 | |
| Alan Foster | .8947 | 186.3 | 1971 | ||
| 5. | Jay Howell | .8846 | 238.3 | 1984 | |
| 6. | Dean Stone | .8750 | 309.3 | 1957 | |
| 7. | Jim O'Toole | .8710 | 351.0 | 1965 | |
| 8. | John Hiller | .8696 | 205.7 | 1972 | |
| 9. | George Blaeholder | .8667 | 328.7 | 1939 | |
| 10. | Hal Reniff | .8571 | 157.3 | 1973 | |
| Pete Richert | .8571 | 222.0 | 1970 | ||
| 12. | Chuck Stobbs * | .8529 | 332.0 | 1951 | |
| 13. | Sandy Koufax * | .8519 | 297.3 | 1960 | |
| Dean Stone | .8519 | 294.7 | 1958 | ||
| 15. | Pat Dobson | .8500 | 212.3 | 1969 | |
| 16. | Kevin Gross | .8462 | 254.7 | 1990 | |
| 17. | Greg Minton | .8421 | 216.7 | 1982 | |
| John Hiller | .8421 | 222.0 | 1970 | ||
| Bud Byerly | .8421 | 158.7 | 1950 | ||
| 20. | Mike Garman | .8400 | 241.3 | 1983 | |
| Rich Bordi | .8400 | 238.7 | 1983 | ||
| Gary Lavelle | .8400 | 228.3 | 1979 | ||
| John Hiller | .8400 | 245.3 | 1975 | ||
| 24. | Willie Hernandez | .8333 | 225.0 | 1988 | |
| John Hiller | .8333 | 240.3 | 1973 | ||
| Rollie Sheldon | .8333 | 269.3 | 1970 | ||
| Gene Conley * | .8333 | 307.3 | 1957 | ||
| 28. | Warren Spahn * | .8286 | 348.7 | 1955 | |
| 29. | Tom Seaver | .8276 | 272.3 | 1970 | |
| Gary Peters | .8276 | 281.0 | 1967 | ||
| Sandy Koufax * | .8276 | 281.7 | 1959 | ||
| 32. | Charlie Williams | .8235 | 168.3 | 1975 | |
| Joe Page | .8235 | 173.0 | 1946 | ||
| Dave Koslo | .8235 | 147.0 | 1944 | ||
| Clint Brown | .8235 | 172.7 | 1932 | ||
| 36. | Jerry Stephenson | .8214 | 245.3 | 1968 | |
| Tom Qualters | .8214 | 292.3 | 1967 | ||
| George Brunet | .8214 | 263.3 | 1960 | ||
| 39. | Allan Anderson | .8182 | 178.3 | 1989 | |
| Pedro Borbon | .8182 | 244.7 | 1973 | ||
| Dick Drago | .8182 | 213.0 | 1973 | ||
| Gene Conley * | .8182 | 343.7 | 1962 | ||
| Dave Koslo | .8182 | 217.7 | 1947 | ||
| 44. | Chuck Stobbs * | .8158 | 355.3 | 1962 | |
| 45. | Jerry Reuss | .8148 | 274.0 | 1976 | |
| 46. | Steve Olin | .8125 | 173.3 | 1990 | |
| Tony Castillo | .8125 | 143.0 | 1990 | ||
| Jerry Stephenson | .8125 | 150.0 | 1970 | ||
| Joe Hoerner | .8125 | 143.7 | 1968 | ||
| Gene Conley * | .8125 | 349.7 | 1961 | ||
| Joe Haynes | .8125 | 166.7 | 1953 | ||
| Chuck Stobbs * | .8125 | 331.0 | 1950 | ||
| 53. | Carl Willis | .8095 | 196.7 | 1987 | |
| Mike McQueen | .8095 | 204.0 | 1984 | ||
| Dan Quisenberry | .8095 | 110.3 | 1983 | ||
| Jerry Stephenson | .8095 | 175.7 | 1971 | ||
| Jackie Collum | .8095 | 204.7 | 1957 | ||
| 58. | Don Demola | .8077 | 243.0 | 1987 | |
| Lance Rautzhan | .8077 | 240.3 | 1980 | ||
| Frank Riccelli | .8077 | 218.0 | 1976 | ||
| Bill Stoneman | .8077 | 257.3 | 1969 | ||
| 62. | Kent Peterson | .8065 | 289.7 | 1958 | |
| Ernie White | .8065 | 316.3 | 1944 | ||
| 64. | Dwight Gooden | .8000 | 237.3 | 1989 | |
| Mike Garman | .8000 | 211.3 | 1982 | ||
| Jim York | .8000 | 206.7 | 1975 | ||
| Hal Reniff | .8000 | 204.3 | 1965 | ||
| Orlando Pena | .8000 | 139.0 | 1962 | ||
| 69. | Bob Friend | .7949 | 364.7 | 1956 | |
| 70. | Warren Spahn * | .7941 | 369.0 | 1950 | |
| Warren Spahn * | .7941 | 367.7 | 1949 | ||
| 72. | Jerry Reuss | .7931 | 282.0 | 1980 | |
| Steve Kline | .7931 | 261.7 | 1976 | ||
| Jim Brewer * | .7931 | 299.7 | 1967 | ||
| 75. | Lance Rautzhan | .7917 | 255.7 | 1982 | |
| Frank Tanana | .7917 | 240.0 | 1978 | ||
| Mike Torrez | .7917 | 234.3 | 1976 | ||
| John Gelnar | .7917 | 275.7 | 1971 | ||
| Billy Hoeft | .7917 | 285.7 | 1961 | ||
| Connie Johnson | .7917 | 247.0 | 1955 | ||
| Ted Gray | .7917 | 299.3 | 1953 | ||
| 82. | Dwight Gooden | .7895 | 207.0 | 1988 | |
| Don Stanhouse | .7895 | 136.0 | 1985 | ||
| Lary Sorensen | .7895 | 214.0 | 1981 | ||
| Bill Butler | .7895 | 206.3 | 1978 | ||
| Ramon Hernandez | .7895 | 166.7 | 1974 | ||
| 87. | Chuck Stobbs * | .7879 | 340.0 | 1964 | |
| Joe Bonikowski | .7879 | 305.0 | 1964 | ||
| Jim Brewer * | .7879 | 277.0 | 1964 | ||
| Don Newcombe | .7879 | 325.0 | 1953 | ||
| Earl Johnson * | .7879 | 317.7 | 1948 | ||
| 92. | Rich Bordi | .7857 | 243.7 | 1984 | |
| Bill Butler | .7857 | 238.0 | 1977 | ||
| Jerry Stephenson | .7857 | 253.7 | 1973 | ||
| Tom Seaver | .7857 | 280.0 | 1971 | ||
| Jim O'Toole | .7857 | 281.3 | 1961 | ||
| Mel Parnell | .7857 | 272.3 | 1948 | ||
| 98. | Paul Dean * | .7838 | 358.7 | 1937 | |
| 99. | Lance Rautzhan | .7826 | 186.0 | 1986 | |
| Willie Hernandez | .7826 | 217.7 | 1983 | ||
| Bill Campbell | .7826 | 217.3 | 1975 | ||
| Steve Hamilton | .7826 | 245.0 | 1964 | ||
| Bill Werle | .7826 | 208.0 | 1950 | ||
| 104. | Bart Johnson | .7813 | 307.0 | 1985 | |
| Gene Conley * | .7813 | 314.0 | 1955 | ||
| 106. | Milt Wilcox | .7778 | 175.3 | 1983 | |
| Frank Tanana | .7778 | 248.0 | 1979 | ||
| Jim Owens | .7778 | 92.3 | 1965 | ||
| Charlie Beamon | .7778 | 273.0 | 1963 | ||
| Johnny Antonelli | .7778 | 308.7 | 1960 | ||
| Bob Miller | .7778 | 312.3 | 1955 | ||
| Ralph Winegarner | .7778 | 243.0 | 1945 | ||
| 113. | Ernie White | .7742 | 334.0 | 1949 | |
| Schoolboy Rowe | .7742 | 304.0 | 1939 | ||
| 115. | Dave Righetti | .7727 | 220.0 | 1986 | |
| Balor Moore | .7727 | 216.7 | 1986 | ||
| Rick Reuschel | .7727 | 258.3 | 1979 | ||
| Gary Bell | .7727 | 259.7 | 1963 | ||
| Ed Head | .7727 | 211.3 | 1955 | ||
| 120. | Gene Conley * | .7714 | 335.0 | 1959 | |
| 121. | John Denny | .7692 | 244.3 | 1987 | |
| Charlie Williams | .7692 | 226.3 | 1974 | ||
| Lew Krausse | .7692 | 243.3 | 1973 | ||
| Rollie Sheldon | .7692 | 326.7 | 1966 | ||
| Herb Score | .7692 | 262.0 | 1960 | ||
| 126. | Humberto Robinson | .7667 | 300.0 | 1959 | |
| Leo Kiely | .7667 | 293.3 | 1959 | ||
| Johnny Antonelli | .7667 | 314.3 | 1958 | ||
| 129. | Phil Hennigan | .7647 | 159.3 | 1980 | |
| Rusty Gerhardt | .7647 | 172.7 | 1976 | ||
| Woodie Fryman | .7647 | 169.7 | 1966 | ||
| Herb Score | .7647 | 324.7 | 1963 | ||
| Billy O'Dell | .7647 | 118.7 | 1960 | ||
| 134. | Joe Magrane | .7619 | 174.0 | 1990 | |
| Don Stanhouse | .7619 | 207.7 | 1983 | ||
| Bill Butler | .7619 | 188.7 | 1975 | ||
| Tom Qualters | .7619 | 241.0 | 1971 | ||
| Buster Narum | .7619 | 160.3 | 1971 | ||
| Ramon Hernandez | .7619 | 236.3 | 1970 | ||
| John Gelnar | .7619 | 222.0 | 1970 | ||
| Ken Sanders | .7619 | 194.7 | 1970 | ||
| George Brunet | .7619 | 245.3 | 1965 | ||
| 143. | Lance Rautzhan | .7600 | 194.3 | 1989 | |
| Tom Hausman | .7600 | 238.3 | 1980 | ||
| Rick Reuschel | .7600 | 264.0 | 1978 | ||
| Rick Wise | .7600 | 259.3 | 1974 | ||
| Bill Landis | .7600 | 242.3 | 1973 | ||
| Mickey Lolich | .7600 | 246.7 | 1972 | ||
| Vida Blue | .7600 | 243.0 | 1972 | ||
| Mickey Lolich | .7600 | 252.0 | 1970 | ||
| Don Sutton | .7600 | 269.0 | 1969 | ||
| Dick Hall | .7600 | 253.0 | 1964 | ||
| George Brunet | .7600 | 280.0 | 1961 | ||
| 154. | Charlie Leibrandt | .7586 | 231.3 | 1988 | |
| Tom Underwood | .7586 | 264.0 | 1978 | ||
| Bob Veale | .7586 | 285.3 | 1966 | ||
| Joe Presko | .7586 | 292.7 | 1962 | ||
| Humberto Robinson | .7586 | 314.3 | 1961 | ||
| Stu Miller | .7586 | 305.0 | 1956 | ||
| Vito Tamulis | .7586 | 285.3 | 1938 | ||
| 161. | Sandy Koufax * | .7576 | 337.7 | 1962 | |
| Chuck Stobbs * | .7576 | 333.0 | 1955 | ||
| Stubby Overmire | .7576 | 319.3 | 1951 | ||
| Earl Johnson * | .7576 | 327.7 | 1946 | ||
| Preacher Roe | .7576 | 314.0 | 1945 | ||
| 166. | Warren Spahn * | .7561 | 378.3 | 1948 | |
| 167. | Randy O'Neal | .7500 | 157.0 | 1990 | |
| Steve Wilson | .7500 | 123.3 | 1990 | ||
| Bob Ojeda | .7500 | 199.7 | 1989 | ||
| Frank Williams | .7500 | 189.3 | 1989 | ||
| Mario Soto | .7500 | 149.0 | 1989 | ||
| Lance McCullers | .7500 | 167.7 | 1986 | ||
| Don Demola | .7500 | 276.0 | 1985 | ||
| Andy Rincon | .7500 | 266.3 | 1985 | ||
| Mike Norris | .7500 | 299.3 | 1984 | ||
| Dave Laroche | .7500 | 130.0 | 1983 | ||
| Dennis Eckersley | .7500 | 274.0 | 1980 | ||
| Bill Butler | .7500 | 212.7 | 1980 | ||
| Gary Nolan * | .7500 | 268.0 | 1978 | ||
| John Hiller | .7500 | 230.7 | 1977 | ||
| Al Holland | .7500 | 164.3 | 1977 | ||
| Masanori Murakami | .7500 | 255.3 | 1976 | ||
| Rich Gossage | .7500 | 204.0 | 1975 | ||
| Mike Garman | .7500 | 130.0 | 1975 | ||
| Dennis Bennett | .7500 | 114.7 | 1973 | ||
| Steve Hargan | .7500 | 272.3 | 1972 | ||
| Al Hrabosky | .7500 | 126.0 | 1972 | ||
| Sandy Koufax * | .7500 | 272.7 | 1971 | ||
| Pedro Borbon | .7500 | 237.3 | 1971 | ||
| John Hiller | .7500 | 221.0 | 1971 | ||
| Fred Lasher | .7500 | 166.0 | 1971 | ||
| Tom Qualters | .7500 | 203.7 | 1969 | ||
| Dick Drott | .7500 | 79.7 | 1969 | ||
| Larry Sherry | .7500 | 234.0 | 1965 | ||
| George Brunet | .7500 | 295.0 | 1962 | ||
| Chuck Stobbs * | .7500 | 375.3 | 1961 | ||
| Chuck Stobbs * | .7500 | 368.0 | 1960 | ||
| Bob Miller | .7500 | 292.0 | 1959 | ||
| Don Gross | .7500 | 91.3 | 1958 | ||
| Chuck Stobbs * | .7500 | 359.3 | 1957 | ||
| Ryne Duren | .7500 | 177.3 | 1957 | ||
| Gene Conley * | .7500 | 253.7 | 1956 | ||
| Bill Wight | .7500 | 303.7 | 1952 | ||
| Fred Hutchinson | .7500 | 269.7 | 1950 | ||
| Howie Pollet | .7500 | 248.0 | 1950 | ||
| Ray Prim | .7500 | 245.3 | 1940 | ||
| Clay Bryant | .7500 | 149.3 | 1939 | ||
| Cy Moore | .7500 | 72.0 | 1936 | ||
| Ed Baecht | .7500 | 219.7 | 1934 | ||
| Bill Swift * | .7500 | 311.7 | 1933 | ||
| Pete Appleton | .7500 | 167.7 | 1933 | ||
| Herm Holshouser | .7500 | 145.0 | 1930 | ||
| 213. | Paul Dean * | .7436 | 350.0 | 1939 | |
| 214. | Eduardo Rodriguez | .7429 | 297.7 | 1986 | |
| Dean Chance | .7429 | 355.7 | 1968 | ||
| Jim Brewer * | .7429 | 286.0 | 1968 | ||
| Billy Hoeft | .7429 | 345.0 | 1964 | ||
| Chuck Stobbs * | .7429 | 349.0 | 1953 | ||
| Bill Wight | .7429 | 322.7 | 1948 | ||
| Ted Lyons | .7429 | 345.0 | 1934 | ||
| 221. | Joe Horlen | .7419 | 328.7 | 1967 | |
| Bill Wight | .7419 | 311.0 | 1949 | ||
| 223. | Lary Sorensen | .7407 | 261.0 | 1986 | |
| Luis Deleon | .7407 | 258.0 | 1984 | ||
| Scott Sanderson | .7407 | 258.0 | 1982 | ||
| Bill Slayback | .7407 | 294.3 | 1981 | ||
| Ed Halicki | .7407 | 260.0 | 1981 | ||
| Rob Dressler | .7407 | 248.0 | 1980 | ||
| Bill Campbell | .7407 | 280.7 | 1978 | ||
| Greg Minton | .7407 | 234.7 | 1978 | ||
| Rollie Fingers | .7407 | 262.7 | 1970 | ||
| Bob Miller | .7407 | 263.0 | 1952 | ||
| 233. | Joe Beckwith | .7391 | 210.3 | 1982 | |
| Steve Carlton * | .7391 | 254.3 | 1977 | ||
| John Hiller | .7391 | 238.0 | 1974 | ||
| Rollie Fingers | .7391 | 225.7 | 1974 | ||
| Juan Marichal * | .7391 | 227.7 | 1973 | ||
| Kent Peterson | .7391 | 263.7 | 1960 | ||
| Ralph Winegarner | .7391 | 243.7 | 1947 | ||
| Ray Prim | .7391 | 216.0 | 1942 | ||
| Hub Pruett | .7391 | 216.3 | 1934 | ||
| 242. | Luis Deleon | .7368 | 171.7 | 1989 | |
| Julio Solano | .7368 | 151.3 | 1989 | ||
| Sid Fernandez | .7368 | 208.0 | 1988 | ||
| Fred Holdsworth | .7368 | 133.0 | 1985 | ||
| Frank Riccelli | .7368 | 203.3 | 1977 | ||
| Jerry Stephenson | .7368 | 193.7 | 1974 | ||
| Chris Van Cuyk | .7368 | 98.7 | 1959 | ||
| Vito Tamulis | .7368 | 356.7 | 1944 | ||
| Hi Bithorn | .7368 | 174.3 | 1944 | ||
| Joe Haynes | .7368 | 345.0 | 1943 | ||
| 252. | Gene Conley * | .7353 | 325.7 | 1966 | |
| Joe Bonikowski | .7353 | 315.7 | 1966 | ||
| Chuck Stobbs * | .7353 | 363.7 | 1958 | ||
| Warren Spahn * | .7353 | 367.7 | 1956 | ||
| Bob Chipman | .7353 | 334.7 | 1950 | ||
| Johnny Sain | .7353 | 333.3 | 1949 | ||
| Earl Johnson * | .7353 | 301.3 | 1947 | ||
| Russ Bauers | .7353 | 332.0 | 1945 | ||
| Earl Johnson * | .7353 | 312.3 | 1944 | ||
| Bob Logan | .7353 | 319.7 | 1943 | ||
| Whit Wyatt | .7353 | 350.0 | 1938 | ||
| 263. | Don Demola | .7333 | 240.3 | 1989 | |
| Mike Norris | .7333 | 263.0 | 1982 | ||
| Jerry Reuss | .7333 | 284.3 | 1981 | ||
| Sandy Koufax * | .7333 | 266.3 | 1970 | ||
| Hal Reniff | .7333 | 272.7 | 1966 | ||
| Hugh Mulcahy | .7333 | 312.3 | 1947 | ||
| Cliff Melton * | .7333 | 276.7 | 1946 | ||
| 270. | Bob Knepper | .7308 | 235.7 | 1986 | |
| Terry Leach | .7308 | 238.7 | 1983 | ||
| Lee Smith | .7308 | 260.7 | 1982 | ||
| Don Demola | .7308 | 265.0 | 1980 | ||
| Masanori Murakami | .7308 | 220.7 | 1975 | ||
| Karl Spooner | .7308 | 286.7 | 1961 | ||
| Pete Appleton | .7308 | 272.3 | 1938 | ||
| 277. | Bob Gibson | .7297 | 340.3 | 1962 | |
| Jack Harshman | .7297 | 319.3 | 1954 | ||
| Robin Roberts | .7297 | 339.7 | 1951 | ||
| Paul Dean * | .7297 | 374.0 | 1936 | ||
| 281. | Joey McLaughlin | .7273 | 213.7 | 1989 | |
| Oil Can Boyd | .7273 | 204.0 | 1988 | ||
| Steve Bedrosian | .7273 | 204.0 | 1988 | ||
| Carl Willis | .7273 | 245.7 | 1984 | ||
| Lance Rautzhan | .7273 | 254.3 | 1983 | ||
| Bo McLaughlin | .7273 | 216.0 | 1983 | ||
| Rick Honeycutt | .7273 | 81.7 | 1981 | ||
| Jim Slaton | .7273 | 208.7 | 1979 | ||
| Tom Hausman | .7273 | 205.7 | 1979 | ||
| Rich Gossage | .7273 | 229.0 | 1976 | ||
| Rob Gardner | .7273 | 227.0 | 1976 | ||
| Pat Dobson | .7273 | 199.0 | 1972 | ||
| John Hiller | .7273 | 215.3 | 1966 | ||
| Don Lee | .7273 | 132.3 | 1964 | ||
| Stubby Overmire | .7273 | 262.0 | 1954 | ||
| Tom Morgan | .7273 | 252.0 | 1953 | ||
| Earl Johnson * | .7273 | 320.3 | 1952 | ||
| Earl Johnson * | .7273 | 323.3 | 1943 | ||
| Roy Sherid | .7273 | 237.7 | 1936 | ||
| 300. | Gary Nolan * | .7241 | 288.0 | 1981 |
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