In his 60+ year career Mercer provided play-by-play broadcasting for minor league teams first the Muskogee Giants of the Class C Western Association; Dallas Rangers (Triple A baseball) from 1959–64, Dallas-Fort Worth Spurs (Texas League baseball) 1965-1971.
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The Texas League underwent a massive face lift in the late 1950s after three of its top franchises — Dallas, Fort Worth and Houston — moved up to the Triple-A American Association for the 1959 season.