India's recent T20 World Cup-winning hero Sanju Samson was back at his best with an unbeaten 101 before spinners tightened the noose as Chennai Super Kings crushed Mumbai Indians by 103 runs in an IPL clash between two five-time champions, here on Thursday.Samson smashed his fifth IPL century, second for CSK in four innings, to power Chennai Super Kings to 207/6 after Mumbai Indians opted to bowl.