XtraTime Web Desk: Defending champions Chennai Super Kings starts their Indian Premier League season 12 with a bang as they beat Royal Challengers Bangalore convincingly by 7 wickets in Chennai in the opening game of the tournament. This time again MS Dhoni was better than his national team skipper Virat Kohli. Earlier Dhoni won the toss and choose to field first in the high voltage encounter. Batting first the visitors could only manage to reach 70 runs before getting all out in 17.1 overs. All the big guns like skipper Virat Kohli (6), AB de Villiers (9), Moeen Ali (9) failed miserably. For CSK veteran Harbhajan Singh (3/20) and Imran Tahir (3/9) were the star with ball. In reply CSK too had a poor start as their opener Shane Watson went for a duck. Ambati Rayudu (28), Suresh Raina (19) and Kedar Jadhav (13*) took the home side over the line.