Raina scored 84 off 57 balls and was the game changer with the ball as well first running out Parthiv Patel (38) and then removing the dangerous J.P. Duminy (0).
Dhoni in the meantime was in mouthwatering form as he smashed 63 off just 19 balls (one four and eight sixes), propelling his team to 202 for four. Super Kings managed to just about sneak past after restricting the opposition to 191 for seven.
The Sunrisers looked well on their way to chasing down the daunting total with openers Patel and Shikhar Dhawan (48) making merry.
It all changed with the introduction of Raina. The off-spinner took two wickets in an over to bring Chennai back into contention and Ravichandran Ashwin then removed the Sunrisers captain to put Chennai in the driving seat.
Darren Sammy, though, refused to give up and smashed 50 off 24 balls to keep Sunrisers hopes alive. But countryman Jason Holder quashed all dreams in the 18th over first removing Karan Sharma (11) and then uprooting Sammy's leg stump.
However, with three dropped catches, the Super Kings fielding left a lot to be desired. Had they not posted such a huge target, these chances could have easily cost them the match.
Earlier, Chennai got off to the worst possible start, losing Murali Vijay in the second ball of the match. Raina and Michael Hussey (23) stabilized things for a while before the Australian fell to the off-spin of Duminy.
Hussey had looked good in his brief innings hitting two fours and a six but Duminy's delivery gripped and spun just the right amount to get the slightest of edges.
Raina then, took control of the match and counter-attacked brilliantly. He took on the Hyderabad bowlers with great success constantly managing to clear the in-field.
Subramaniam Badrinath (13) played the perfect sheet anchor role handing the strike to his more aggressive partner at every opportunity.
As Badrinath fell and Dhoni walked out, his home crowd went into frenzy.
Dhoni sent the decibel level rising almost immediately as he lofted Duminy out of the boundary on only his second ball.
Sri Lankan all-rounder Thisara Perera bore the brunt of Dhoni's rampage as he was hit for five sixes in the 18th over, giving away 34 runs in it.
Raina and Dhoni together scored 60 runs off just 25 balls before Perera caught the left-hander brilliantly at the long-on boundary.
After scoring 11 runs of his first seven balls, the Indian captain went on to score 52 runs of the next 12. His fifty in 16 balls is the fastest half-century in CLT20.
Chennai brought about their fourth fifty in just 14 balls, due to Dhoni and Raina's dominance.
--IANS (Posted on 27-09-2013)