Nick Lars Heidfeld ( born May 10 , 1977 in MÃ nchengladbach , West Germany ) is a German racing driver In 2010 he was the test and reserve driver for the Mercedes GP Formula One team . Nick Lars Heidfeld ( born May 10 , 1977 in MÃ nchengladbach , West Germany ) is a German racing driver , who currently races in Formula One for the Lotus Renault GP team as a replacement for the injured Robert Kubica .