A hamstring injury ruled Mumbai Indians skipper Rohit Sharma out of the IPL game against Chennai Super Kings in Sharjah, UAE on Friday. But his absence hardly made a difference as the defending champions rocked Chennai top-order, with Trent Boult and Jasprit Bumrah taking a brace of wickets each inside the first four overs. Chennai were reeling at 21/5 (5.2 overs).