Coming at a crucial juncture, Jadeja first hit a quickfire 29-ball 48 and then scalped five wickets for 16 to put Chennai back to winning ways after they lost the tournament opener against Mumbai Indians by eight wickets.
After Jadeja's show with the bat, West Indian Dwayne Bravo played a special unbeaten knock of 18-ball 43 towards the end to propel Chennai to an imposing 193 for six at Dr Y S Rajasekhara Reddy ACA-VDCA Cricket Stadium here.
Bravo provided the late burst with some lusty hitting as the visitors piled up 40 runs in the last two overs. He struck five sixes, including three off Manpreet Gony's last over.
Chennai bowlers complemented their batsmen's superb show by bowling out Deccan for 119 in 17.1 overs.
Apart from Jadeja, Shadab Jakati (2/14) and Doug Bollinger (2/20) also chipped in with two wickets apiece.
Chasing a stiff target, Deccan lost two wickets early in the form of Daniel Harris (15) and Shikhar Dhawan (21).
The home side failed to build up any substantial partnership and kept losing wickets at regular intervals.
Openers Harris and Dhawan gave Deccan a good start, adding 32 runs in the first four overs.
Bollinger provided the breakthrough when Harris was caught behind by CSK skipper and wicketkeeper Mahendra Singh Dhoni.
Dhawan too followed suit as he was caught by Bravo off Suresh Raina at deep mid-wicket.
New man in Parthiv Patel (20) made his intentions clear from the outset as he hit Bollinger for two fours in the sixth over.
However, his stay was shortlived as he was cleaned up by Jadeja in the 11th over.