The 1883 major league baseball season was contested from May 1 through September 30, 1883. It was the second season for the American Association (AA) and eighth season for the National League (NL). The Philadelphia Athletics won the AA pennant, while the Boston Beaneaters won the NL pennant. There was no postseason, although there was a canceled exhibition series between the two pennant winners.
Prior to the season, the Troy Trojans and Worcester Worcesters of the National League folded. In its place, the league enfranchised two teams: the New York Gothams and Philadelphia Quakers (today's San Francisco Giants and Philadelphia Phillies). It was decided that the six-team American Association would expand to eight teams and saw the minor league New York Metropolitans join and the enfranchisement of the Columbus Buckeyes.
Prior to the season, the Boston Red Caps and St. Louis Brown Stockings renamed as the Boston Beaneaters and St. Louis Browns, respectively.
The American Association and the National League, along with the Northwestern League, sign the Tripartite Agreement (also known as the National Agreement). This agreement binds the leagues to respect each other's valid player contracts as well as increasing the size of the reserve list from 6 to 11 players.
The 1883 schedule consisted of 98 games for all teams in the American Association and National League, each of which had eight teams. Each team was scheduled to play 14 games against the other seven teams of their respective league. This format was unique to the 1883 season. Previously, the National League had played an 84-game schedule, with 12 games against each team being played, while a pre-expansion six-team American Association had played an 80-game schedule, with 16 games against each team being played. The following season would see the National League play a 112-game schedule (increase of 14 to 16 games each), while the American Association would expanded again, this time to twelve teams, for a 110-game schedule (of 10 games against each of the other eleven teams).
Opening Day took place on May 1 featuring all sixteen teams. American Association would see its final day of the regular season on September 30 featuring four teams, while the National League would see its final day of the regular season on September 29, featuring all eight teams.
The 1883 season saw the following rule changes:
An asterisk (*) denotes the ballpark a team played the minority of their home games at
6 tie games (1 in AA, 5 in NL), which are not factored into winning percentage or games behind (and were often replayed again) occurred throughout the season.
The Louisville Eclipse and New York Metropolitans had one tie game each.
The Cleveland Blues and Detroit Wolverines had three tie games each. The New York Gothams had two tie games. The Buffalo Bisons and Philadelphia Quakers had one tie game each.
<sup>1</sup> All-time single-season losses record
The 1883 season saw the American Association and National League each with two new teams, all playing at new venues:
The Polo Grounds, home of the New York Metropolitans and Gothams, featured two baseball fields, at the southeast and southwest of the grounds. The Gothams played entirely at the southeast grounds, while the Metropolitans moved alternated. The played ten games at the southeast diamond to start the season, before moving to the southwest diamond on May 30. The southwest diamond was of worse quality than the southeast diamond, so games at the southwest diamond did not last long. They played only ten games (aside from a one-off at the southeast diamond on June 13) before returning to the southeast diamond in July. They did play three more games at the southwest diamond on August 30, 31, and September 4 due to scheduling conflicts with the Gothams.
Following a fire and a flood of their home at Exposition Park, the Pittsburgh Alleghenys had to move into a newly built venue, a second iteration of Exposition Park, which was built immediately south. However, after only 17 games, they played their last game there on June 9 and returned to the first Exposition Park on June 12.
The 1883 season saw two teams relocate to new ballparks:
The 1883 season saw four teams play their final games at respective ballparks, before moving to new ballparks for the season: