Earlier, Suresh Raina (75 off 47 balls), who had missed a couple of matches due to a calf injury, smashed his way to an unbeaten 75 laced with six fours and four sixes after opener Ambati Rayudu set the foundation for Chennai with a 35-ball 46-run knock. Skipper Mahendra Singh Dhoni also chipped in with 26 off 21 balls which was studded three boundaries and a six but Mumbai Indians bowled well in the death overs to restrict them within 170 in the end.