The Excelsior Club of Chicago in the NABBP were one of the earliest known baseball teams. Based in Chicago, their earliest known game was played in 1858. The Chicago Tribune, May 31, 1868, has an article on the new grounds of the Excelsior club, on State St. near 23rd, a fenced in area 475 x 700 "perfectly smooth and level" with an amphitheater for the fans and facilities for the players. The Chicago Tribune Aug. 15, 1865 says their grounds are at the corner of May and West Lake Sts.