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Arthur Irwin was born in 1858 in Toronto, Ontario, to an Irish blacksmith and a Canadian mother. As a child, he moved with his family to Boston and attended school there. He played local amateur baseball from 1873 until he was recruited by the Worcester Ruby Legs of the National Association in 1879. In late 1879, manager Frank Bancroft took Irwin and most of the other Worcester players on a baseball tour which included visits to New Orleans and Cuba.

Irwin's major league career began when the Ruby Legs moved into the National League (NL) in 1880. He led the league in assists in his rookie season, and remained with the team through 1882, when it folded due to poor attendance. Irwin next spent three seasons with the Providence Grays, and was captain and starting shortstop of the 1884 Providence team that became world champions. The 1884 Grays featured star pitchers Charles Radbourn and Charlie Sweeney; the two hurlers did not get along well, and Sweeney left the team in the middle of the season. The club folded after a fourth-place finish in 1885.  Irwin moved on to the newly formed Philadelphia Quakers in 1886. Tragedy struck the Philadelphia squad in 1888 when pitcher Charlie Ferguson developed typhoid fever, dying at Irwin's home.  During the 1889 season, Irwin went to the Washington Nationals for his first opportunity as player-manager, although the team folded at the end of the season. He next played for the Boston Reds in the Players' League in 1890. That same year, Irwin coached the baseball team at Dartmouth College. While Irwin served as a player-manager for Boston in 1890, he was able to focus on the managerial role for the team in 1891. That year the team signed his brother, John Irwin, on May 21. Newspapers brought accusations of nepotism and criticized John's mediocre play. John Irwin was released by Boston on July 16, and his major league playing career was over by the next month.  Although Irwin's regular playing career ended after the 1890 season, he appeared in six games while managing the Boston team after it moved to the American Association in 1891. He also played in one game while managing the 1894 Philadelphia Phillies. A left-handed hitter, Irwin finished his playing career with 1,015 games played and batted .241 in 4,190 plate appearances. He tallied 396 runs batted in and 552 runs scored. Stolen bases were not awarded until 1886, but Irwin tallied 93 stolen bases in his last 532 games. He recorded an .878 career fielding percentage, committing 647 errors in 5,317 fielding chances. Irwin played 947 games at shortstop and 56 games at third base. He also appeared at second base, pitcher and catcher.
Arthur Irwin