That honor goes to Brandon Belt’s first-inning at-bat against the Los Angeles Angels on April 22, 2018. The Giants’ first baseman saw 10 pitches by the time the count ran full, fouling off six and whiffing on another...then fouled off 10 more before finally flying out to right. In total, Jaime Barria (the unfortunate starting pitcher that day) threw Belt 21 pitches.
That said, pitches per plate appearance only started getting counted in 1988. Major League Baseball has been around for over a century, and it’s possible that another plucky batter hung in for more than 21 pitches before ‘88. The late Luke Appling, for instance, claimed to have had at least a 28 pitch plate appearance in 1940, but the Washington Post looked into it, and it looks like that’s a tall tale. Belt’s at-bat is the most verifiable marathon we’ve got.
Oh, and if you have 12 minutes and 45 seconds, here’s Belt’s at-bat. It’s wild.
An MLB Debut is when a player makes his first appearance onto the field or at the plate
The MLB team with the longest undefeated record in history is the 1916 New York Giants, who went 26 games without a loss.
The record for the longest home run streak in MLB history is eight consecutive games, achieved by Ken Griffey Jr. in 1993 and Don Mattingly in 1987.
http://mlb.mlb.com/mlb/history/all_star_event.jsp?story=5
The Oakland As 20 consecutive wins 2002
The longest scoreless game in MLB history was on April 15, 1968 when the Mets and Astros went 23 scoreless innings. The Astros won the game 1-0 in the 24th inning
592 feet hitten by Tony C at age 19
Click on the 'Longest MLB Games' link on the page to learn more about the longest games in MLB history.
In MLB history, that would be 26 innings pitched by Leon Cadore of the Brooklyn Robins and Joe Oeschger of the Boston Braves on May 1, 1920. The game ended in a 1-1 tie (called due to darkness) and is the longest game, innings wise, in MLB history.
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Not long
The longest game in Chicago Cubs history was on May 17, 1927, when they beat the Boston Braves, 4-3, in 22 innings. That's 4 innings short of the longest game in MLB history, as of mid-July 2011.