Mr Ganesh is a local RK Nagar resident and had the support of the DMK and Left parties. But his chances were the brightest during the cancelled round of by-polls in April when the DMK had hoped the AIADMK votes would split between the two factions led by Chief Minister E Palaniswami and O Panneerselvam.
Like his rival from the AIADMK Mr Madhusudhanan, Mr Ganesh also spent decades in Chennai. He comes from the middle-class background and graduated from the Sir Theagaraya College in New Washermenpet.
A journalist by profession and a practising lawyer, Mr Ganesh is a native of Madurai who was born and brought up in Chennai. By all accounts, he is being seen as a dark horse.
The Left parties and the MDMK are supporting the DMK, which wants to win RK Nagar to deliver a big psychological blow to the AIADMK and support its claim that the ruling party has lost popular support after the death of Ms Jayalalithaa only months after she led her party to a big win in the assembly elections last year.