The Lotus Racing driver, a former winner of the annual exhibition event, lost control of his Audi R8 sportscar and ploughed into the barriers and a concrete wall.
"Hardcore shunt with throttle jammed and rear suspension damaged, got knocked out, now some medical checkups," Kovalainen said on his Twitter feed before later reporting all was well.
His British girlfriend Catherine Hyde, who was a passenger in the car, was unhurt.
Portuguese GT racer Filipe Albuquerque was the surprise winner of the event after beating France's seven times world rally champion Sebastien Loeb in the final.
Albuquerque had earlier beaten new Formula One champion Sebastian Vettel, who had himself overcome compatriot and seven times champion Michael Schumacher in the quarter-final, to the disappointment of the home crowd.
However, Vettel and Schumacher together won the Nations Cup for the fourth year in a row.

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Bloody typical, ain't it. Plop your bird in the passenger seat and disengage brain whilst trying to "wow" and "aaaa" their knickers off, and then you go an put it in a ditch...or in Heikki's case, a wall.
What's the dumbest stuff you've done to show off to your better half, your better half you hope to have, or, well, Eric....
















