John J. Sweeney
- Bats Unknown, Throws Unknown
- Height 5' 8", Weight 155 lb.
Rooney Sweeney played three years in the major leagues, managing to play in three different leagues in three years. Sporting Life several times referred to him as "famous" or "well-known".
In 1889, he played for an independent club called the Metropolitans.
In 1890 he was in a Canadian jail. He stated that there was a poker game, a cat upset the chips, and Sweeney grabbed his share "and it got me into jail, that's all".
In 1892 he tried managing prizefighters.
Sporting Life reported on September 25, 1897 that Sweeney was on his deathbed. He was assisting the boatmen at Battery Park in New York City when he reportedly had an epileptic fit, fell, and hit his head. In spite of that, in 1899 he was reported to be working as a fireman on a tug boat.