Jadeja claimed three wickets for 20 with the ball and scored an unbeaten 36 off just 14 deliveries to steer Chennai to the four-wicket win.
"He is really developing, both in the changing room and obviously as a player. He is gaining a lot of confidence, he is becoming more confident with his peers. When you have the Indian captain and some key players that make a big difference within the side. It's no doubt he turned the match today," Fleming said in the post-match press conference.
Lauding his team's fielding effort, the former New Zealand skipper said Michael Hussey's diving catch to dismiss Gautam Gambhir followed by Subramaniam Badrinath's direct hit to run out experienced Jacques Kallis made the difference.
"There was a good catch from Hussey and an excellent run-out by Badri. At 49 after seven overs you think it's going to be a good score. Our fielding came to the fore and made a big difference to the game. We are very proud of that," Fleming said.