I thought it didn't ring true.
From Ed Reitan's site:
http://www.novia.net/~ereitan/rca-nbc_firsts.html
"March 19, 1954 - The first colorcast of a sport event, a boxing match from Madison Square Garden, was presented by NBC. (Maybe the first by NBC, but not the first color sports, as baseball and football were colorcast by the CBS system)."
[Edited to add the date!]