| Singles | |
|---|---|
| 2017 Tallahassee Tennis Challenger | |
| Champion |  Blaž Rola |
| Runner-up |  Ramkumar Ramanathan |
| Score | 6–2, 6–7(6–8), 7–5 |
Quentin Halys was the defending champion but chose not to defend his title.
Blaž Rola won the title after defeating Ramkumar Ramanathan 6–2, 6–7(6–8), 7–5 in the final. [1]
Frances Tiafoe (withdrew)
Darian King (first round)
Henri Laaksonen (second round)
Guido Andreozzi (quarterfinals, retired)
Peter Polansky (first round) Leonardo Mayer (second round) Stefan Kozlov (quarterfinals) Máximo González (first round)| Semifinals | Final | ||||||||||||
| Q |  Andrea Arnaboldi | 2 | 7 | 4 | |||||||||
| Ramkumar Ramanathan | 6 | 5 | 6 | ||||||||||
| Ramkumar Ramanathan | 2 | 78 | 5 | ||||||||||
| Q | Blaž Rola | 6 | 66 | 7 | |||||||||
| Mitchell Krueger | 3 | 7 | 4 | ||||||||||
| Q | Blaž Rola | 6 | 5 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| LL | S Bangoura | 6 | 1 | 2 | |||||||||||||||||||||||
| WC | C Harrison | 3 | 6 | 6 | WC | C Harrison | 4 | 3 | |||||||||||||||||||
 J Hernández-Fernández | 3 | 6 | 3 | Q | A Arnaboldi | 6 | 6 | ||||||||||||||||||||
| Q | A Arnaboldi | 6 | 1 | 6 | Q | A Arnaboldi | 6 | 78 | |||||||||||||||||||
 A Ghem | 1 | 1 | WC | B Klahn | 2 | 66 | |||||||||||||||||||||
| Q |  D Köpfer | 6 | 6 | Q | D Köpfer | 5 | 1 | ||||||||||||||||||||
| WC | B Klahn | 710 | 65 | 6 | WC | B Klahn | 7 | 6 | |||||||||||||||||||
| 8 | M González | 68 | 77 | 4 | Q | A Arnaboldi | 2 | 7 | 4 | ||||||||||||||||||
| 4 | G Andreozzi | 6 | 6 | R Ramanathan | 6 | 5 | 6 | ||||||||||||||||||||
| LL |  DE Galán | 4 | 4 | 4 | G Andreozzi | 0 | 6 | 4 | |||||||||||||||||||
| D Shapovalov | 5 | 63 |  V Millot | 6 | 4 | 0r | |||||||||||||||||||||
| V Millot | 7 | 77 | 4 | G Andreozzi | 6 | 5 | 1r | ||||||||||||||||||||
 J McGee | 6 | 6 | R Ramanathan | 4 | 7 | 1 | |||||||||||||||||||||
 R Quiroz | 4 | 4 | J McGee | 6 | 3 | 2 | |||||||||||||||||||||
| R Ramanathan | 6 | 7 | R Ramanathan | 3 | 6 | 6 | |||||||||||||||||||||
| 5 | P Polansky | 1 | 5 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | S Kozlov | 6 | 4 | 6 | |||||||||||||||||||||||
| F Coria | 3 | 6 | 4 | 7 | S Kozlov | 2 | 6 | 6 | |||||||||||||||||||
 J Melzer | 7 | 6 | J Melzer | 6 | 3 | 4 | |||||||||||||||||||||
| PR | A González | 5 | 2 | 7 | S Kozlov | 4 | 5 | ||||||||||||||||||||
| M Krueger | 3 | 7 | 6 | M Krueger | 6 | 7 | |||||||||||||||||||||
 C O'Connell | 6 | 5 | 2 | M Krueger | 6 | 6 | |||||||||||||||||||||
| T Sandgren | 5 | 4 | 3 | H Laaksonen | 3 | 2 | |||||||||||||||||||||
| 3 | H Laaksonen | 7 | 6 | M Krueger | 3 | 7 | 4 | ||||||||||||||||||||
| 6 | L Mayer | 6 | 6 | Q | B Rola | 6 | 5 | 6 | |||||||||||||||||||
| Q |  J Statham | 4 | 2 | 6 | L Mayer | 2 | 4 | ||||||||||||||||||||
| Q | B Rola | 6 | 6 | Q | B Rola | 6 | 6 | ||||||||||||||||||||
| WC | M Giron | 2 | 4 | Q | B Rola | 6 | 6 | ||||||||||||||||||||
| D Novikov | 6 | 62 | 6 | D Novikov | 1 | 2 | |||||||||||||||||||||
| M McDonald | 3 | 77 | 3 | D Novikov | 6 | 7 | |||||||||||||||||||||
| J-P Smith | 6 | 6 | J-P Smith | 3 | 5 | ||||||||||||||||||||||
| 2 | D King | 3 | 4 | ||||||||||||||||||||||||
Rubén Ramírez Hidalgo was the defending champion, but decided not to compete.
Blaž Rola was the defending champion, but did not participate.
Novak Djokovic defeated Tomáš Berdych in the final, 7–5, 4–6, 6–3 to win the singles tennis title at the 2015 Monte-Carlo Masters. It was his second Monte-Carlo Masters title, and he became the first man to win the first three ATP Tour Masters 1000 titles of the season.
Máximo González was the defending champion, but he lost in the second round.
Rogério Dutra Silva was the defending champion, but he lost in the quarterfinals to José Hernández.
Ivo Karlović was the defending champion from when the tournament was last held in 2008, but chose not to participate.
Rafael Nadal was the defending champion, but lost to Dominic Thiem in the semifinals.
Pablo Cuevas was the defending champion and successfully defended his title, defeating Pablo Carreño Busta in the final, 7–6(7–4), 6–3.
Íñigo Cervantes was the defending champion but chose not to participate.
Go Soeda was the defending champion but chose not to defend his title.
Darian King was the defending champion but chose not to defend his title.
Ernesto Escobedo was the defending champion but chose not to defend his title.
Blaž Rola was the defending champion but lost in the first round to Marc Polmans.
Yasutaka Uchiyama was the defending champion but chose not to defend his title.
Thanasi Kokkinakis was the defending champion but chose not to defend his title.
Nikoloz Basilashvili defeated Roberto Bautista Agut in the final, 7–6(7–5), 6–2 to win the men's singles tennis title at the 2021 Qatar Open. Basilashvili saved a match point against Roger Federer in the quarterfinals.
Francisco Cerúndolo was the defending champion but chose not to defend his title.
Kamil Majchrzak was the defending champion but chose not to defend his title.
Emil Ruusuvuori was the defending champion but chose not to defend his title.
Blaž Rola was the defending champion but chose not to defend his title.