Ramaswamy Prasanna was batting on 50 when he got injured while attempting a run, ramming into Bengal pacer Ashok Dinda.
Prasanna hit 11 boundaries and a six during his unbeaten 104-run knock and stitched 107 runs with Baba Aparajith (60) for fifth wicket.
Tamil Nadu had scored 230 in their first innings, thereby taking a 22-run lead over the hosts who were bowled out for 208 in their first innings.
Tamil Nadu entered the Ranji Trophy final for the 11th time by virtue of having taken the first-innings lead.
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