At a match game of base ball played yesterday at the Base-ball park between the Union Base ball club and the Missouri gymnasium nine, the latter were victorious by a score of 24 to 15.St. Louis Republican, June 7, 1874
This is actually rather interesting. The Union Club had essentially disbanded their baseball club after the 1870 season and there were attempts over the next few years to put a nine back in the field. For the most part, however, these attempts failed and the Union Club was never able to put a high level team together again. This 1874 match shows that the club was still trying to put a team together and the results of the match shows that they were not having much success with it.
In all reality, this was not the "Union Club" of the amateur era but just a nine thrown together by the Union Club, which was still operating as a social club in 1874.