Renault call up Heidfeld as stand-in

Sauber Formula One driver Nick Heidfeld of Germany walks along the pits after the second practice session of the Singapore F1 Grand Prix at the Marina Bay circuit September 24, 2010.LONDON - Renault called up German Formula One driver Nick Heidfeld on Wednesday as a possible replacement for injured Robert Kubica.The team said in a statement that Heidfeld, who last raced with Sauber in 2010, would