Mumbai, April 20 -- Ravindra Jadeja (53* off 35) and Shivam Dube (50 off 32) launched a calculated assault to propel Chennai Super Kings to 176/5 after Mumbai Indians chose to bowl first in their IPL clash on Sunday. Early momentum came from 17-year-old Ayush Mhatre, who announced himself on the big stage with a blistering 15-ball 32, including four boundaries and two sixes, one of them a memorable pick-up shot over deep mid-wicket that had the Wankhede buzzing. He looked poised for a longer stay before holing out to Mitchell Santner off Deepak Chahar just as CSK began to build steam at 57/2 in the 7th over. Shaik Rasheed followed shortly, stumped by Ryan Rickelton off Santner, as CSK stumbled to 63/3 at eight overs. Enter Dube and Jadeja,...