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From Wikipedia, the free encyclopedia

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 on the pitching mound in a 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 ⅓ innings, 72 and ⅔ 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.

Decline

The only active players in the top 100 all-time at the end of the 2009 season were Tom Glavine (ranked 30th with 4,413⅓ IP), Randy Johnson (ranked 38th with 4,135⅓), Jamie Moyer (ranked 45th with 3,908⅔) and John Smoltz (ranked 74th with 3473). This is because over time, innings pitched has declined. Several factors are responsible for this decline:

  • From 1876–1892, pitchers threw from fifty feet and exerted less stress on their arms (also pitchers often threw underhand in this era). In this era, innings pitched totals of 600 innings were not uncommon.
  • In 1892, pitchers moved back to the current distance of sixty feet, six inches. However, they still often threw 400 innings in a season. This was because the home run was far less common and pitchers often conserved arm strength throughout the game.
  • From 1920 to the 1980s, the four-man pitching rotation was well established. Pitchers could no longer throw 400 innings in a season, as the home run meant a run could be scored at any time. The league leader in innings pitched often threw somewhat more than 300 innings. Occasionally, innings pitched would spike, as in the early 1970s, when Wilbur Wood pitched 376⅔ innings in 1972 and then 359⅓ innings in 1973.
  • From the 1980s to the present, the four-man rotation was replaced with the five-man rotation, with a weak fifth man who would often be skipped on off days. Also, managers starting using their bullpens more and more, accelerating the decline in innings pitched. Today, rarely more than a few pitchers pitch more than 250 innings in a season.

All-time leaders

Rank Player Innings pitched
1 Cy Young 7,354⅔
2 Pud Galvin 6,003⅓
3 Walter Johnson 5,914⅔
4 Phil Niekro 5,404⅓
5 Nolan Ryan 5,386
6 Gaylord Perry 5,350⅓
7 Don Sutton 5,282⅓
8 Warren Spahn * 5,243⅔
9 Steve Carlton * 5,217⅓
10 Grover Cleveland Alexander 5,190
11 Kid Nichols 5,056⅓
12 Tim Keefe 5,047⅔
13 Greg Maddux 5,008⅓
14 Bert Blyleven 4,970
15 Bobby Mathews 4,956⅓
16 Roger Clemens 4,916⅔
17 Mickey Welch 4,802
18 Tom Seaver 4,782⅔
19 Christy Mathewson 4,780⅔
20 Tommy John * 4,710⅓
* Pitched left-handed
Active players in bold
Through 4/17/08

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