Actor-turned-politician Vijay's Tamilaga Vettri Kazhagam (TVK) is leading in nearly 100 seats in Tamil Nadu with just over 10% of the votes counted, according to Election Commission of India data.
The ruling Dravida Munnetra Kazhagam (DMK) is currently in third place with 47 seats, while the All India Anna Dravida Munnetra Kazhagam (AIADMK)-led NDA alliance is third with 76.
Vijay's party, in its maiden elections, is ahead in 95 of the state's 234 seats, and will need an alliance to take power if trends persist.
Tamil Nadu has been governed by one of the two Dravidian parties since 1967, and Vijay is contesting two constituencies — Perambur in Chennai and Tiruchirappalli East — and was leading in both.
Chief minister MK Stalin was trailing the TVK's VS Babu in the Kolathur seat by over 2,500 votes.