Lewis Hamilton will begin Sunday as favourite to defend his crown . But David Coulthard has questioned his focus ahead of the 2015 campaign . Hamilton has been in-demand away from the circuit over the winter and he is also in the closing stages of finalising a big-money deal with Mercedes . The campaign gets underway on the new season when Melbourne plays hosts to the sason-opening Australian Grand Prix . CLICK HERE for all the latest F1 news .
Lewis Hamilton will begin the new season as favourite to defend his crown . But David Coulthard has questioned his focus ahead of the 2015 campaign . Hamilton has been in-demand away from the circuit over the winter and he is also in the closing stages of finalising a big-money deal with Mercedes . The campaign gets underway on Sunday when Melbourne plays hosts to the sason-opening Australian Grand Prix . CLICK HERE for all the latest F1 news .