Baseball Unofficial Perfect Games
There have been three instances in which a major league pitcher retired every player he faced over nine innings without allowing a baserunner, but, by the current definition, is not credited with a perfect game, either because there was already a baserunner when he took the mound, or because the game went into extra innings and an opposing player eventually reached base:
  • On June 23, 1917, Babe Ruth, then a pitcher with the Boston Red Sox, walked the Washington Senators' first batter, Ray Morgan, on four straight pitches. Ruth, who had already been shouting at umpire Brick Owens about the quality of his calls, became even angrier and, in short order, was ejected. Enraged, Ruth charged Owens, swung at him, and had to be led off the field by a policeman. Ernie Shore came in to replace Ruth. Morgan was caught stealing by Sox catcher Pinch Thomas on the first pitch by Shore, who proceeded to retire the next 26 batters. All 27 outs were made while Shore was on the mound. Once recognized as a perfect game by Major League Baseball, this still counts as a combined no-hitter.
  • On May 26, 1959, Harvey Haddix of the Pittsburgh Pirates pitched what is often referred to as the greatest game in baseball history. Haddix carried a perfect game through an unprecedented 12 innings against the Milwaukee Braves, only to have it ruined when an error by third baseman Don Hoak allowed Felix Mantilla, the leadoff batter in the bottom of the 13th inning, to reach base. A sacrifice by Eddie Matthews and an intentional walk to Hank Aaron followed; the next batter, Joe Adcock, hit a home run that became a double when he passed Aaron on the bases. Haddix and the Pirates had lost the game 1–0; despite their 12 hits in the game, they could not bring a run home. The 12 perfect innings 36 consecutive batters retired in a single game remains a record.
  • On June 3, 1995, Pedro Martínez of the Montreal Expos had a perfect game through nine innings against the San Diego Padres. The Expos scored a run in the top of the tenth inning, but in the bottom, Martínez gave up a leadoff double to Bip Roberts, and was relieved by Mel Rojas, who retired the next three batters. Martínez was therefore the winning pitcher in a 1–0 Expos victory.

Four other "perfect games" are unofficial because the games were called off before nine innings were played:

  • On August 11, 1907, Ed Karger of the St. Louis Cardinals pitched seven perfect innings against the Boston Braves; second game of doubleheader called by prior agreement.
  • On October 5, 1907, Rube Vickers of the Philadelphia Athletics pitched five perfect innings against the Senators; second game of doubleheader called on account of darkness. Vickers achieved his feat on the last day of the season. Remarkably, he also pitched the final 12 innings of the 15-inning first game. His back-to-back victories were his only wins of the year.
  • On August 6, 1967, Dean Chance of the Minnesota Twins pitched five perfect innings against the Red Sox; game called on account of rain.
  • On April 21, 1984, David Palmer of the Expos pitched five perfect innings against the Cardinals; second game of doubleheader called on account of rain.

On March 14, 2000, in a spring training game by definition unofficial the Red Sox used six pitchers to retire all 27 Toronto Blue Jays batters in a 5–0 victory. The starting pitcher for the Red Sox was Pedro Martínez.