Lewis Hamilton remains cautious about his chances before the first Grand Prix of the Formula One motor racing season. Australian Warne, widely regarded as cricket’s greatest leg-spinner, treated World Champion Lewis Hamilton and his McLaren team-mate Heikki Kovalainen to the softest of deliveries at a sponsors event at Fawkner Park on Thursday before the McLaren drivers head for more serious business at the nearby Albert Park circuit.  In the build up to the first grand prix of the season in Melbourne, McLaren have been slower in pre-season testing than the new Brawn GP team (formerly Honda), Ferrari and BMW-Sauber with Toyota, Renault and Williams not been far behind the pace-setters. Hamilton won the Australian Grand Prix last season on his way to his first World Championship but is by no means the favourite this year.