Yuvraj Singh’s performance at the recent ICC Knockout Tournament might not have helped India to lay its hands on the glittering trophy but his performance has kindled a ray of hope. He, together with players like Zaheer Khan and Vijay Dahiya, has brought a whiff of fresh air into Indian cricket, mired as it was over the past few months by the issues of betting and match-fixing, observes Abhijit Chatterjee