1873 in baseball

Champions

 * National Association: Boston Base Ball Club

National Association final standings


Notable seasons

 * Boston Red Stockings second baseman Ross Barnes leads the NA with 138 hits, 43 stolen bases, 125 runs scored, a .431 batting average, a 1.080 OPS, and a 207 OPS+.
 * Boston Red Stockings pitcher Al Spalding has a record of 41–14, leading the NA with 41 wins and 496.2 innings pitched. His 50 strikeouts rank second in the league. He has a 2.99 earned run average and a 115 ERA+.

January–March

 * March 3 – For the first time, the NA adopts a standardized ball to be used in all league games.

April–June

 * May 14 – Nearly 5,000 fans watch the upstart Philadelphia Club defeat the established Athletics 5–4 in 13 innings. Only once before, in 1865, had that many innings been played in one game.
 * June 7 – Mutual and Philadelphia combine for 40 errors. The Philadelphias, aided by the Mutuals' 26 miscues, win 12–10.
 * June 11 – 10,000 fans are in attendance see Philadelphia score 5 runs in the 7th inning to defeat Athletic 7–5.

July–September

 * July 4 – Leading 11–3 over Resolute of Elizabeth, the Bostons score 21 runs in the bottom of the 9th inning for a 32–3 victory. The home-ahead rule would not be instituted for 6 more years.
 * July 22 – Tom Barlow of Atlantic lays down 6 bunts, all for hits, in a game against Lord Baltimore.
 * July 24 – Bob Ferguson of the Atlantic is the umpire in a game between Mutual of New York and Lord Baltimore which ends with the Mutuals scoring 3 runs in the bottom of the 9th for an 11–10 victory. Ferguson and Mutual's Nat Hicks get into an altercation with Ferguson breaking Hicks' arm by hitting him with a bat.  Ferguson requires a police escort to leave the field and Hicks will be out for 2 months due to the incident.
 * August 16 – Boston defeats Philadelphia 11–8 in Chicago in front of several thousand fans. After the game, it is announced that Chicago has signed several players in hopes of placing a team in the NA for the 1874 season.

October–December

 * October 16 – Lord Baltimore turns a triple play in a losing cause against Philadelphia.
 * October 22 – Boston wins the pennant for the 2nd year in a row. They clinch on the same date as they had in 1872.
 * November 6 – A crosstown benefit game is played between the Philadelphia and Athletic Clubs under a proposed rule of 10 men on the field and 10 innings for a game. The extra player is placed on the infield as a right shortstop and with most observers feeling the extra player unnecessary, the rule is never implemented.

Births

 * January 10 – Chick Stahl
 * January 10 – Jack O'Neill
 * January 19 – Arlie Pond
 * January 23 – Red Donahue
 * February 5 – Jack O'Brien
 * February 20 – Tom O'Brien
 * March 10 – Gene DeMontreville
 * March 29 – Duff Cooley
 * April 7 – John McGraw
 * April 22 – Frank Figgemeier
 * May 23 – "Brewery" Jack Taylor
 * June 13 – Walter Coleman
 * July 11 – Jimmy Slagle
 * July 19 – Harry Davis
 * August 26 – Chick Fraser
 * October 5 – Claude Ritchey
 * October 9 – Bill Reidy
 * November 4 – Bobby Wallace
 * November 10 – Willie McGill
 * November 24 – Ed Doheny
 * November 29 – Jake Weimer
 * December 6 – Harry Wolverton
 * December 9 – Oscar Purner
 * December 14 – John Anderson

Deaths

 * February 26 – Cy Bentley, 22, pitcher and right fielder for the 1872 Middletown Mansfields.