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The first sport sedan
was the first real sport sedan but that's not so.
--The Jaguar 3.4 Mk.I was introduced ca. 1955 and eventually morphed into the beloved 3.8 Mk.II, a formidable factor in sedan racing during the 60's.
--Another candidate would be the Alfa Giulietta
Berline. I'm not sure what year it was introduced but it and it's descendants definitely
did well in racing.
--The MiniCooper S was tearing up the racetracks of Europe and America well before the introduction of the 2002.
Any other candidates?