The bye-election was necessitated after the seat fell vacant following the demise of TDP MLA Tangirala Prabhakar.
He died of heart-attack soon after being elected to the first Assembly of new Andhra Pradesh.
The TDP has fielded Prabhakar's daughter Soumya, a software engineer and requested other parties not to field candidates so as to make the election unanimous, party sources said.
While the YSR Congress agreed not to jump into the fray, Congress chose to field B Babu Rao, a local Dalit leader against the TDP nominee.
Nominations will be scrutinised tomorrow and the last date for withdrawal is August 30.