Australia vs India: Pat Cummins and his crew have dealt India knockout blows in big games before. Two years ago at The Oval, they defeated India to hoist the World Test Championship mace; a year ago, they made more than a lakh spectators mourn in the 50-over World Cup final at Ahmedabad. “The most beautiful sound of silence,” the Australia captain captured the winning emotion poetically. He is already a successful and proven captain, but the biggest challenge for his team would be to beat India in a full Test series. If Ashes campaigns have shaped the legacies of Australian captains of the past, the latest Border-Gavaskar Trophy episode could define Cummins’ reign. Australia have gone winless in four series, both home and away. The last captain to taste a Test series win against India was Michael Clarke, nine years ago. Five members of the present squad featured in that series —Cummins was not among them — but it feels like an eternity away. In this span, Australia reclaimed the urn and retained it three …