Well i don't count a Lancer EVO or a WRX as a true sports car, because at heart they are standard mass-market sedan, most of the performance addons are done well after the car design is complete.
I'd call them performance sedans... yet somehow they feel to me, closer to a sports car, than say an HSV Clubsport.

Compare them to a Lotus Elise, Vaxhaul VX-220, Mazda MX-5..., and you'll see the differences, Every aspect of the car, from the moment of conception, was designed as a sports car. You don't have to be a small, opentop, 2 seater to be a sports car thou.