Andhra Pradesh chief minister N. Chandrababu Naidu is trailing in Kuppam Assembly segment by 67 votes, according to trends from the Election Commission.
The Telugu Desam Party supremo is fighting YSR Congress' Krishna Chandra Mouli.
The YSR Congress established early leads after counting of postal ballots was done for the 175 Assembly and 25 Lok Sabha seats that went to polls on April 11.
YSRC president Jaganmohan Reddy secured a lead of over 2,000 votes in Pulivendula assembly segment, according to the Election Commission.
As per initial trends, the YSRC is leading in over 15 Assembly segments while the ruling Telugu Desam Party is ahead in four.
YSRC candidates have also established early leads in Kadapa and Rajampet Lok Sabha constituencies.