Quality start


In baseball, a quality start is a statistic for a starting pitcher defined as a game in which the pitcher completes at least six innings and permits no more than three earned runs.
The quality start was developed by sportswriter John Lowe in 1985 while writing for the Philadelphia Inquirer. ESPN.com terms a loss suffered by a pitcher in a quality start as a tough loss and a win earned by a pitcher in a non-quality start a cheap win.
Nolan Ryan has used the term "High Quality Start" for games where the pitcher goes seven innings or more and allows three earned runs or fewer.

All-Time

As of the end of the 2014 Major League Baseball season, the highest "quality start" percentage for a given season in the live-ball era was recorded by Greg Maddux, who had 24 of them in 25 games in 1994. Dwight Gooden was 33-for-35 in 1985.
Since 1921, and through the 2014 MLB season, the overall leaders by percentage :
  1. Jacob deGrom
  2. Clayton Kershaw
  3. Tom Seaver
  4. Adam Wainwright
  5. Mel Stottlemyre
  6. Félix Hernández
  7. Bob Gibson
  8. David Price
  9. Jered Weaver
  10. Spud Chandler
  11. Randy Johnson

    Criticisms

High ERA

An early criticism of the statistic, made by Moss Klein, writing in The Sporting News, is that a pitcher could conceivably meet the minimum requirements for a quality start and record a 4.50 ERA, which is generally seen as undesirable. Bill James addressed this in his 1987 Baseball Abstract, saying the hypothetical example was extremely rare among starts recorded as quality starts, and that he doubted any pitchers had an ERA over 3.20 in their quality starts. This was later confirmed through computer analysis of all quality starts recorded from 1984 to 1991, which found that the average ERA in quality starts during that time period was 1.91.

Complete games

Another criticism against the statistic is that it is not beneficial for pitchers who pitch many innings per start. If a pitcher allows three earned runs in six innings, he gets a quality start with an ERA of 4.50 for that game. But if a pitcher pitches for nine innings and allows four earned runs, he would have a 4.00 ERA, but would not get a quality start. Former pitcher Carl Erskine said "in my day, a quality start was a complete game... you gave everybody a day's rest."
That the category is more reliable in the aggregate can be seen with countervailing individual examples, such as the ones listed by Sports Illustrated writer Joe Posnanski in a 2011 piece on the subject:

Possible new criteria

Due to the reasons listed above, some have proposed a possible change in the criteria for a quality start. One of the proposals includes that for every two innings pitched, the starter is allowed to give up one earned run, and as long as he pitches five innings, a quality start would be recorded. This criterion would give Randy Johnson and Gaylord Perry listed in the above examples quality starts. This criteria would still allow a pitcher to have a 4.50 ERA and earn a quality start, but would better represent a quality start.
Dayn Perry of CBS Sports has introduced what he calls the "Dominant Start". This stat would award a pitcher with a Dominant Start if he goes at least eight innings, and give up no more than one run, earned or unearned. This stat means that if a pitcher pitches a complete game and gives up two unearned runs, he would not get a Dominant Start. Perry argues that this stat would better show which pitchers are truly the best in all of baseball.