# 2020 Calgary National Bank Challenger – Singles

Ivo Karlović was the defending champion but lost in the third round to Geoffrey Blancaneaux.
Arthur Rinderknech won the title after defeating Maxime Cressy 3–6, 7–6$^{(7–5)}$, 6–4 in the final.

## Seeds

All seeds receive a bye into the second round.
* Vasek Pospisil (second round)
* Go Soeda (second round)
* Ivo Karlović (third round)
* Tatsuma Ito (second round)
* Brayden Schnur (third round)
* Thai-Son Kwiatkowski (second round)
* Liam Broady (semifinals)
* Arthur Rinderknech (champion)
* Julian Lenz (third round)
* Maxime Cressy (final)
* Tobias Kamke (quarterfinals)
* Akira Santillan (second round)
* JC Aragone (third round)
* Geoffrey Blancaneaux (quarterfinals)
* Gonçalo Oliveira (quarterfinals)
* Manuel Guinard (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| | Kacper Żuk | 6 | 6 | | | | | | | | | | | |
| 11 | Tobias Kamke | 4 | 4 | | | | | | | | | | | |
| 11 | Tobias Kamke | 4 | 4 | | | Kacper Żuk | 3 | 6$^3$ | | | | | | |
| | | | | | 8 | Arthur Rinderknech | 6 | 7$^7$ | | | | | | |
| 14 | Geoffrey Blancaneaux | 4 | 2 | | 8 | Arthur Rinderknech | 6 | 7$^7$ | | | | | | |
| 8 | Arthur Rinderknech | 6 | 6 | | | | | | | | | | | |
| 8 | Arthur Rinderknech | 6 | 6 | | | | | | | 8 | Arthur Rinderknech | 3 | 7$^7$ | 6 |
| | | | | | | | | | | 10 | Maxime Cressy | 6 | 6$^5$ | 4 |
| 10 | Maxime Cressy | 4 | 7$^{13}$ | 6 | | | | | | | | | | | 10 | Maxime Cressy | 6 | 6$^5$ | 4 |
| | Yusuke Takahashi | 6 | 6$^{11}$ | 4 | | | | | | | | | | |
| | Yusuke Takahashi | 6 | 6$^{11}$ | 4 | 10 | Maxime Cressy | 6 | 4 | 7$^7$ | | | | | |
| | | | | | 7 | Liam Broady | 3 | 6 | 6$^5$ | | | | | |
| 7 | Liam Broady | 7$^7$ | 2 | 6 | 7 | Liam Broady | 3 | 6 | 6$^5$ | | | | | |
| 15 | Gonçalo Oliveira | 6$^4$ | 6 | 4 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | V Pospisil | 4 | 6 | 4 | | | | | | | | |
| | R Sarmiento | 3 | 4 | | | K Żuk | 6 | 4 | 6 | | | | | | | | |
| | K Żuk | 6 | 6 | | | | | | | | K Żuk | 7$^8$ | 6 | | | | |
| Q | Felix Corwin | 6 | 6 | | | | | | | 13 | JC Aragone | 6$^6$ | 4 | | | | |
| LL | D Novikov | 4 | 4 | | Q | F Corwin | 2 | 1 | | | | | | | | | |
| | | | | | 13 | JC Aragone | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | K Żuk | 6 | 6 |
| | | | | | | | | | | | | | | 11 | T Kamke | 4 | 4 |
| | | | | | 11 | T Kamke | 6 | 6 | | | | | | | | | |
| | F Peliwo | 6 | 7 | | | F Peliwo | 4 | 0 | | | | | | | | | |
| | Jumpei Yamasaki | 1 | 5 | | | | | | | 11 | T Kamke | 7$^7$ | 6 | | | | |
| PR | B Mott | 3 | 6 | 6 | | | | | | 5 | B Schnur | 6$^5$ | 3 | | | | |
| WC | A Galarneau | 6 | 4 | 1 | PR | B Mott | 4 | 4 | | | | | | | | | |
| | | | | | 5 | B Schnur | 6 | 6 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 3 | I Karlović | 7$^7$ | 6 | | | | | | | | | | |
| | R Peniston | 3 | 4 | | | E King | 6$^2$ | 4 | | | | | | | | | | |
| | E King | 6 | 6 | | | | | | | 3 | I Karlović | 6$^7$ | 4 | | | | | |
| | B Lock | 6 | 6$^5$ | 6 | | | | | | 14 | G Blancaneaux | 7$^9$ | 6 | | | | | |
| | S Shimabukuro | 4 | 7$^7$ | 2 | | B Lock | 2 | 0 | | | | | | | | | | |
| | | | | | 14 | G Blancaneaux | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 14 | G Blancaneaux | 4 | 2 |
| | | | | | | | | | | | | | | | 8 | A Rinderknech | 6 | 6 |
| | | | | | 9 | J Lenz | 6 | 3 | 7$^7$ | | | | | | | | | |
| | Shintaro Imai | 6 | 6 | | | S Imai | 3 | 6 | 6$^3$ | | | | | | | | | |
| LL | H Heliövaara | 0 | 2 | | | | | | | 9 | J Lenz | 7$^9$ | 3 | 6$^3$ | | | | |
| | C Altamirano | 6 | 7$^{10}$ | | | | | | | 8 | A Rinderknech | 6$^7$ | 6 | 7$^7$ | | | | |
| | Fabrizio Ornago | 3 | 6$^8$ | | | C Altamirano | 6 | 3 | 3 | | | | | | | | | |
| | | | | | 8 | A Rinderknech | 3 | 6 | 6 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 6 | T-S Kwiatkowski | 6 | 3 | 6$^6$ | | | | | | | | | |
| | L Caruana | 2 | 4 | | A Dougaz | 4 | 6 | 7$^8$ | | | | | | | | | |
| | A Dougaz | 6 | 6 | | | | | | | A Dougaz | 0 | 1$^r$ | | | | | |
| | Jacob Grills | 2 | 4 | | | | | | 10 | M Cressy | 6 | 4 | | | | | |
| | P Niklas-Salminen | 6 | 6 | | P Niklas-Salminen | 3 | 2 | | | | | | | | | | |
| | | | | 10 | M Cressy | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | 10 | M Cressy | 4 | 7$^{13}$ | 6 |
| | | | | | | | | | | | | | | Y Takahashi | 6 | 6$^{11}$ | 4 |
| | | | | 16 | M Guinard | 7$^7$ | 6$^4$ | 6$^4$ | | | | | | | | | |
| | Tobias Simon | 7$^7$ | 6 | | T Simon | 6$^3$ | 7$^7$ | 7$^7$ | | | | | | | | | |
| WC | Taha Baadi | 6$^2$ | 2 | | | | | | | T Simon | 4 | 6$^4$ | | | | | |
| | Y Takahashi | 6 | 6 | | | | | | | Y Takahashi | 6 | 7$^7$ | | | | | |
| | Quentin Robert | 4 | 4 | | Y Takahashi | 6 | 6 | | | | | | | | | | |
| | | | | 4 | T Ito | 3 | 3 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | L Broady | 6 | 7 | | | | | | | | | | | |
| | Gage Brymer | 6 | 7$^7$ | | | G Brymer | 1 | 5 | | | | | | | | | | | |
| WC | G Diallo | 2 | 6$^2$ | | | | | | | 7 | L Broady | 4 | 6 | 6 | | | | | |
| | N Chappell | 6 | 6 | | | | | | | | N Chappell | 6 | 4 | 2 | | | | | |
| WC | Joshua Peck | 1 | 4 | | | N Chappell | 6 | 6$^5$ | 6 | | | | | | | | | | |
| | | | | | 12 | A Santillan | 4 | 7$^7$ | 1 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 7 | L Broady | 7$^7$ | 2 | 6 |
| | | | | | | | | | | | | | | | 15 | G Oliveira | 6$^4$ | 6 | 4 |
| | | | | | 15 | G Oliveira | 6 | 6 | | | | | | | | | | | |
| | MF Descotte | 6$^5$ | 7$^7$ | 6 | | MF Descotte | 4 | 4 | | | | | | | | | | | |
| WC | C Harper | 7$^7$ | 6$^3$ | 4 | | | | | | 15 | G Oliveira | 6$^6$ | 6 | 6 | | | | | |
| | H Bourchier | 3 | 6$^7$ | | | | | | | Q | A Rybakov | 7$^8$ | 3 | 4 | | | | | |
| Q | A Rybakov | 6 | 7$^9$ | | Q | A Rybakov | 7$^7$ | 6$^5$ | 7$^7$ | | | | | | | | | | |
| | | | | | 2 | G Soeda | 6$^4$ | 7$^7$ | 6$^2$ | | | | | | | | | | |