Innings pitched
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In baseball, innings pitched (IP) are the number of innings a pitcher has completed, measured by the number of batters and baserunners that are put out while the pitcher is in the game. Three outs made is equal to one inning pitched. One out counts as one-third of an inning, and two outs counts as two-thirds of an inning. Sometimes, the statistic is written 34.1, 72.2, or 91.0, for example, to represent 34 and 1/3 innings, 72 and 2/3 innings, and 91 innings exactly, respectively.
Runners left on base by a pitcher are not counted in determining innings pitched. It is possible for a pitcher to enter a game, give up several hits and possibly even several runs, and be removed before achieving any outs, thereby recording a total of zero innings pitched.
| 1 | Cy Young | 7356.0 |
| 2 | Pud Galvin | 5941.1 |
| 3 | Walter Johnson | 5914.1 |
| 4 | Phil Niekro | 5404.1 |
| 5 | Nolan Ryan | 5386.0 |
| 6 | Gaylord Perry | 5350.1 |
| 7 | Don Sutton | 5282.1 |
| 8 | Warren Spahn | 5243.2 |
| 9 | Steve Carlton | 5217.1 |
| 10 | Grover Cleveland Alexander | 5190.0 |
| 11 | Kid Nichols | 5056.1 |
| 12 | Tim Keefe | 5047.2 |
| 13 | Bert Blyleven | 4970.0 |
| 14 | Bobby Mathews | 4956.0 |
| 15 | Mickey Welch | 4802.0 |
| 16 | Tom Seaver | 4782.2 |
| 17 | Christy Mathewson | 4780.2 |
| 18 | Tommy John | 4710.1 |
| 19 | Roger Clemens | 4704.1 |
| 20 | Robin Roberts | 4688.2 |
All of these pitchers are right handed except Spahn, Carlton, and John.
The only active players in the top 50 at the end of the 2005 season were Roger Clemens, above, Greg Maddux (ranked 29th, 4406.1 IP), and Tom Glavine (ranked 40th, 3951.2 IP).