| Singles | |
|---|---|
| 2015 Emami Kolkata Open ATP Challenger Tour | |
| Champion |  Radu Albot |
| Runner-up |  James Duckworth |
| Final score | 7–6(7–0), 6–1 |
Ilija Bozoljac was the defending champion, but lost in the first round.
Radu Albot won the title, defeating James Duckworth in the final, 7–6(7–0), 6–1.
James Duckworth (final)
Alexander Kudryavtsev (quarterfinals)
Ruben Bemelmans (semifinals)
Somdev Devvarman (first round) Luke Saville (first round) Radu Albot (champion) Alex Bolt (second round, withdrew) Kimmer Coppejans (second round)| Semifinals | Final | ||||||||||||
| 1 | James Duckworth | 2 | 6 | 6 | |||||||||
| 3 | Ruben Bemelmans | 6 | 3 | 1 | |||||||||
| 1 | James Duckworth | 60 | 1 | ||||||||||
| 6 | Radu Albot | 77 | 6 | ||||||||||
 Chen Ti | 4 | 6 | 2 | ||||||||||
| 6 | Radu Albot | 6 | 2 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Duckworth | 6 | 3 | 6 | |||||||||||||||||||||||
| Q | VS Prashanth | 3 | 6 | 3 | 1 | J Duckworth | 6 | 6 | |||||||||||||||||||
| WC | J Nedunchezhiyan | 6 | 2 | 0 | WC | S Singh | 2 | 1 | |||||||||||||||||||
| WC | S Singh | 2 | 6 | 6 | 1 | J Duckworth | 6 | 6 | |||||||||||||||||||
| WC | S Nagal | 5 | 5 |  E Gerasimov | 4 | 2 | |||||||||||||||||||||
| E Gerasimov | 7 | 7 | E Gerasimov | w/o | |||||||||||||||||||||||
| S Myneni | 5 | 4 | 7 | A Bolt | |||||||||||||||||||||||
| 7 | A Bolt | 7 | 6 | 1 | J Duckworth | 2 | 6 | 6 | |||||||||||||||||||
| 3 | R Bemelmans | 6 | 1 | 6 | 3 | R Bemelmans | 6 | 3 | 1 | ||||||||||||||||||
 M Safwat | 1 | 6 | 3 | 3 | R Bemelmans | 3 | 6 | 6 | |||||||||||||||||||
| Q |  K Krawietz | 6 | 77 | Q | K Krawietz | 6 | 2 | 3 | |||||||||||||||||||
| Q | Vinayak Sharma Kaza | 2 | 64 | 3 | R Bemelmans | 65 | 710 | 6 | |||||||||||||||||||
| S Balaji | 5 | 5 | Q | R Becker | 77 | 68 | 2 | ||||||||||||||||||||
| Q | R Becker | 7 | 7 | Q | R Becker | 4 | 6 | 6 | |||||||||||||||||||
 T Androić | 2 | 4 | 8 | K Coppejans | 6 | 3 | 3 | ||||||||||||||||||||
| 8 | K Coppejans | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | L Saville | 3 | 6 | 2 | |||||||||||||||||||||||
| T Chen | 6 | 3 | 6 | T Chen | 6 | 4 | 6 | ||||||||||||||||||||
 I Bozoljac | 6 | 64 | 3 |  FF Silva | 0 | 6 | 2 | ||||||||||||||||||||
| FF Silva | 4 | 77 | 6 | T Chen | 6 | 3 | 77 | ||||||||||||||||||||
| P Krstin | 6 | 3 | 1r | R Ramanathan | 4 | 6 | 65 | ||||||||||||||||||||
| M Janković | 4 | 6 | 3 | M Janković | 1 | 7 | 5 | ||||||||||||||||||||
| R Ramanathan | 4 | 6 | 6 | R Ramanathan | 6 | 5 | 7 | ||||||||||||||||||||
| 4 | S Devvarman | 6 | 3 | 4 | T Chen | 4 | 6 | 2 | |||||||||||||||||||
| 6 | R Albot | 7 | 4 | 6 | 6 | R Albot | 6 | 2 | 6 | ||||||||||||||||||
| N Mektić | 5 | 6 | 3 | 6 | R Albot | 6 | 2 | 6 | |||||||||||||||||||
 E López-Pérez | 2 | 2 | Y Bhambri | 3 | 6 | 1 | |||||||||||||||||||||
| Y Bhambri | 6 | 6 | 6 | R Albot | 77 | 6 | |||||||||||||||||||||
| T-h Yang | 65 | 6 | 6 | 2 | A Kudryavtsev | 65 | 3 | ||||||||||||||||||||
| D Pérez Sanz | 77 | 1 | 2 | T-h Yang | 79 | 1 | 0 | ||||||||||||||||||||
| WC | P Gunneswaran | 3 | 67 | 2 | A Kudryavtsev | 67 | 6 | 6 | |||||||||||||||||||
| 2 | A Kudryavtsev | 6 | 79 | ||||||||||||||||||||||||
Yuki Bhambri was the defending champion but decided not to participate.
Stanislas Wawrinka was the defending champion, but withdrew before the event started.
Carlos Berlocq won the title, defeating Tomáš Berdych in the final, 0–6, 7–5, 6–1.
Matt Reid was the defending champion, but lost in the first round to Radu Albot.
Chung Hyeon won the title, defeating Alex Bolt in final, 6–2, 7–5.
Somdev Devvarman was the defending champion and successfully defended his title, defeating Yuki Bhambri in the final, 3–6, 6–4, 6–0.
Saketh Myneni and Sanam Singh were the defending champions, but lost in the first round.
Diego Schwartzman was the defending champion, but chose not to participate.
Ernests Gulbis won the last edition of the tournament held in 2013, but lost in the first round to Marcos Baghdatis.
Milos Raonic won the title, defeating João Sousa in the final, 6–3, 3–6, 6–3.
Jared Donaldson was the defending champion, but he lost in the first round to Alex Bolt.
Ivo Karlović was the defending champion, but lost to John-Patrick Smith in the first round.
Guillermo García-López was the defending champion, but lost in the semifinals to Fernando Verdasco.
Kevin Anderson was the defending champion, but lost in the second round to Jiří Veselý.
Milos Raonic was the defending champion, but lost in the second round to Mikhail Youzhny.
This was the first edition of the men's tournament.
Jack Sock was the defending champion, but lost in the second round to Peter Gojowczyk.
Rajeev Ram and Joe Salisbury won the men's doubles tennis title at the 2020 Australian Open, defeating wildcards Max Purcell and Luke Saville in the final, 6–4, 6–2.
Radu Albot was the defending champion, but lost in the first round to Jack Sock.
First seed Alexander Zverev won the tournament, defeating second seed Diego Schwartzman 6–2, 6–1 in the final. This was the first edition of the tournament, primarily organised due to the cancellation of many tournaments in 2020, due to the COVID-19 pandemic.
Matteo Berrettini was the defending champion from when the event was last held in 2019, but could not participate since he was still competing in the 2021 French Open at the beginning of the tournament.
Roger Federer was the defending champion from when the event was last held in 2019, but lost in the second round to Félix Auger-Aliassime.
Arthur Rinderknech was the defending champion but chose not to defend his title.