Rechristened Emami Kolkata Open, the USD 50,000 event will have all the top ranked Indian Davis Cup singles players.
Apart from Devvarman and Bhambri, the main draw will feature three more Indians in Saketh Myneni, Ramkumar Ramanathan and N Sriram Balaji.
All eyes will be on Devvarman and Bhambri, who have made the last four of the ongoing USD 1,00,000 ATP Challenger in Delhi along with Belgians Ruben Bemelmans and Kimmer Coppejans.
23-year-old Aussie Duckworth is the highest ranked (107), followed by Russian Alexander Kudryavtsev (117) and Devvarman (136) as they are likely to get the top three seedings when the draw is made Sunday.
Duckworth incidentally was ousted by Sanam Singh in pre-quarterfinals of the ongoing Delhi Open.
Kudryavtsev was given the top billing in the last edition of the ATP Challenger in Kolkata, which was won by Serbian Ilija Bozoljac who will also look to defend his crown.