They began slowly in their run chase and they were dealt with a blow as Murali Vijay was out for just one in the second over as his stump flew cartwheeling while trying to hit a swinging full delivery without moving his feet.
At three for one, Chennai had to settle down for a while but they did not take much time to launch their attack with du Plessis and Hussey finding the boundaries to keep the asking rate under control.
Du Plessis punished Mitchel Starc with a six in the fourth over while Hussey also found a boundary as Chennai took 12 runs from that over.
Du Plessis then smashed three fours off Pat Cummins in the next over which yielded 13 runs before launching Hazlewood for a six and a then a four in the seventh over.
In Image: Chennai Super Kings batsman Murali Vijay, second from left, leaves the field after being bowled by Sydney Sixers bowler Mitchell Starc, second from right