The 2010 AC St. Louis season was the club's first and last season of professional soccer. The Saints in the NASL Conference of the USSF D2 Pro League, the second tier of the American Soccer Pyramid. The league was a temporary professional soccer league created by the United States Soccer Federation (USSF) in 2010 to last just one season, as a compromise between the feuding United Soccer Leagues (USL) and the North American Soccer League (NASL).