PIT Pirates

Professional baseball in the Pittsburgh area began in 1876 with the organization of the Allegheny Base Ball Club, an independent (non-league) club based in a then-separate city called Allegheny City, across the Allegheny River from Pittsburgh. The team joined the minor league International Association in 1877, only to fold the following season. On October 15, 1881, Denny McKnight held a meeting at Pittsburgh's St. Clair Hotel to organize a new Allegheny club, which began play in 1882 as a founding member of the American Association. Chartered as the Allegheny Base Ball Club of Pittsburgh, the team was listed as "Allegheny" in the standings, and was sometimes called the "Alleghenys" (rarely the "Alleghenies") in that era's custom of referring to a team by its pluralized city or club name. After five mediocre seasons, Pittsburgh became the first A.A. team to switch to the older National League in 1887.

Before the 1890 season, almost all of the Alleghenys' best players bolted to the Players' League's Pittsburgh Burghers. The Players' League collapsed after the season, and the players were allowed to go back to their old clubs. However, the Alleghenys also scooped up highly regarded second baseman Lou Bierbauer, who had previously played with the A.A.'s Philadelphia Athletics. Although the Athletics had failed to include Bierbauer on their reserve list, they loudly protested the Alleghenys' move. In an official complaint, an AA official claimed the Alleghenys' signing of Bierbauer was "piratical". This incident quickly accelerated into a schism between the leagues that contributed to the demise of the A.A. Although the Alleghenys were never found guilty of wrongdoing, their allegedly "piratical" act gained them the occasional nickname "Pirates" starting in 1891. Within a few years, the nickname caught on with Pittsburgh newspapers. The nickname was first acknowledged on the team's uniforms in 1912.

After almost two decades of mediocre baseball, the Pirates' fortunes began to change at the turn of the 20th century. The Pirates acquired several star players from the Louisville Colonels, who were slated for elimination when the N.L. contracted from 12 to 8 teams. (The franchises did not formally consolidate; the player acquisitions were separate transactions.) Among those players was Honus Wagner, who would become one of the first players inducted to the Baseball Hall of Fame. The Pirates were among the best teams in baseball in the early 1900s, winning three consecutive National League pennants from 1901 to 1903 and participating in the first modern World Series ever played, which they lost to Boston. The Pirates returned to the World Series in 1909, defeating the Detroit Tigers for their first-ever world title. That year, the Pirates moved from Exposition Park to one of the first steel and concrete ballparks, Forbes Field.

As Wagner aged, the Pirates began to slip down the National League standings in the 1910s, culminating in a disastrous 51–103 record in 1917; however, veteran outfielder Max Carey and young players Pie Traynor and Kiki Cuyler, along with a remarkably deep pitching staff, brought the Pirates back to relevance in the 1920s. The Pirates won their second title in 1925, becoming the first team to come back from a 3–1 deficit in the World Series. The Pirates returned to the World Series in 1927 but were swept by the Murderer's Row Yankees. The Pirates remained a competitive team through the 1930s but failed to win the pennant, coming closest in 1938 when they were passed by the Chicago Cubs in the final week of the season.

Despite the prowess of Ralph Kiner as a slugger, the Pirates were mostly miserable in the 1940s and 1950s. Branch Rickey was brought in to rebuild the team, which returned to the World Series in 1960. They were outscored over the course of the series by the Yankees, yet the Pirates won on a walk-off home run by Bill Mazeroski in the bottom of the 9th inning in Game 7. As of 2022, it is the only Game 7 walk-off home run in World Series history.

Led by right fielder Roberto Clemente, the Pirates remained a strong team throughout the 1960s but did not return to the World Series until 1971. Playing in the new Three Rivers Stadium, the Pirates defeated the favored Baltimore Orioles behind Clemente's hitting and the pitching of Steve Blass. In the same year on September 1, the Pirates became the first team to field an all-Black and Latino lineup. Despite Clemente's death after the 1972 season, the Pirates were one of the dominant teams of the decade, winning the newly created National League East in 1970, 1971, 1972, 1974, 1975, and 1979. Powered by sluggers such as Willie Stargell, Dave Parker, and Al Oliver, the team was nicknamed "The Lumber Company." Behind Stargell's leadership and the disco song "We Are Family" (which the team adopted as its theme song), the Pirates came back from a 3–1 deficit to once again defeat the Orioles in the 1979 World Series for the franchise's fifth championship. During the 1979 championship season, a Pittsburgh player was designated as Most Valuable Player in every available category: All-Star Game MVP (Dave Parker), NLCS MVP (Willie Stargell), World Series MVP (Willie Stargell), and National League MVP (Willie Stargell, shared with Keith Hernandez of St. Louis).

The Pirates sank back into mediocrity in the 1980s and returned to post-season play in the early 1990s behind young players like Barry Bonds, Bobby Bonilla, and Doug Drabek. The Pirates won three straight division titles from 1990 to 1992 but lost in the National League Championship Series each time, notably coming within one out of advancing to the World Series in 1992. Several of the team's best players, including Bonds and Drabek, left as free agents after that season.

With salaries rising across baseball, the small-market Pirates struggled to keep pace with the sport and they posted a losing record for 20 consecutive seasons, a record among North American professional sports teams. Even the opening of a new stadium in 2001, PNC Park, did little to change the team's fortunes. The Pirates finally returned to the postseason in 2013 behind National League MVP Andrew McCutchen, defeating the Cincinnati Reds in the Wild Card Game. They were eliminated in five games in the next round by the St. Louis Cardinals. That season, the Pirates also became the seventh MLB team to reach 10,000 all-time wins. On Opening Day 2015 the Pirates' loss was the team's 10,000th making the Pirates the fourth MLB team to achieve this distinction, following the Philadelphia Phillies, Atlanta Braves, and the Chicago Cubs. The Pirates returned to the postseason in 2014 and 2015 and lost the Wild Card game both times and have not qualified for the playoffs since then.