By Daniel Moxon Lewis Hamilton feels Mercedes can improve in Melbourne this weekend – but fears Max Verstappen is already too far ahead to catch. He is sure that his Red Bull rival already has the title sewn up despite only two races of 24 having been held so far. Mercedes are once again off the pace despite more optimism around the potential of their W15 car. Speaking ahead of this weekend’s Australian Grand Prix, Hamilton again spoke highly of his latest machine. And the seven-time world champion hopes he can fare better than he did in Jeddah a fortnight ago, where he finished just ninth. He…