Resuming at the overnight 123 for 5, Central Zone kept losing wickets at regular intervals with skipper Piyush Chawla being the team's top-scorer with a fine knock of 56.
In reply, South Zone were cruising along with captain Abhinav Mukund (61) and Baba Aparajith (35) at the crease when stumps were drawn for the day.
The hosts now need to score just 73 more runs to take first innings lead and barring a collapse they would book their berth in the title clash.
Chawla tried to hold fort for some time but after a 42-run seventh-wicket partnership with Jalaj Saxena, he became spinner Pragyan Ojha's second wicket in an overall tally of 3/49. Chawla's stay at the crease yielded four fours and three sixes.
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The batsmen that followed him could not make much of as Central Zone folded for 209. Besides Ojha, Abhimanyu Mithun also grabbed a three-wicket haul, conceding merely 29 runs in his 14 overs.
In response, South made a good start with Mukund and Akshath Reddy (16) putting on 44 runs for the opening wicket. Chawla broke the stand before Umesh Yadav accounted for Lokesh Rahul (11).
Mukund, on the other hand, has so far struck five fours in his 195-ball knock.
Brief Scores:
Central Zone: 209 all out in 85.4 overs (Piyush Chawla 56; Abhimanyu Mithun 3/29, Pragyan Ojha 3/49)
South Zone: 137 for two in 63 overs (Abhinav Mukund 61 batting; Umesh Yadav 1/36).