Chennai Super Kings captain Mahendra Singh Dhoni won the toss and elected to bat first against Mumbai Indians in their Champions League Twenty20 opener in Chennai on Saturday. Teams: Chennai Super Kings: Mahendra Singh Dhoni  (capt), Murali Vijay, Mike Hussey, Suresh Raina, S Badrinath, Albie Morkel, Dwayne Bravo, Wriddhiman Saha, R Ashwin, Doug Bollinger, Shahdab Jakati.…