# 2019 Columbus Challenger II – Singles

J. J. Wolf was the defending champion but lost in the second round to Nam Ji-sung.
Mikael Torpegaard won the title after defeating Nam 6–1, 7–5 in the final.

## Seeds

All seeds receive a bye into the second round.
* Michael Mmoh (second round, retired)
* Yasutaka Uchiyama (quarterfinals)
* Emilio Gómez (quarterfinals)
* Donald Young (second round)
* Darian King (withdrew)
* Dudi Sela (semifinals, retired)
* Roberto Quiroz (second round)
* Mikael Torpegaard (champion)
* Tim Smyczek (third round)
* Li Zhe (second round)
* Lee Duck-hee (third round)
* Thai-Son Kwiatkowski (semifinals)
* Filip Peliwo (second round)
* J. J. Wolf (second round)
* Collin Altamirano (third round)
* João Menezes (quarterfinals)

## 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 | Final | Final | Final | Final |
| | Nam Ji-sung | 6 | 6 | | | | | | | | | |
| | Zhang Zhizhen | 3 | 2 | | | | | | | | | |
| | Zhang Zhizhen | 3 | 2 | | | Nam Ji-sung | 6 | 5 | | | | |
| | | | | | 6 | Dudi Sela | 3 | 3$^r$ | | | | |
| 16 | João Menezes | 6 | 3 | 1 | 6 | Dudi Sela | 3 | 3$^r$ | | | | |
| 6 | Dudi Sela | 4 | 6 | 6 | | | | | | | | |
| 6 | Dudi Sela | 4 | 6 | 6 | | | | | | Nam Ji-sung | 1 | 5 |
| | | | | | | | | | 8 | Mikael Torpegaard | 6 | 7 |
| 12 | Thai-Son Kwiatkowski | 2 | 6 | 6 | | | | | | | | | 8 | Mikael Torpegaard | 6 | 7 |
| 3 | Emilio Gómez | 6 | 0 | 3 | | | | | | | | |
| 3 | Emilio Gómez | 6 | 0 | 3 | 12 | Thai-Son Kwiatkowski | 4 | 6$^5$ | | | | |
| | | | | | 8 | Mikael Torpegaard | 6 | 7$^7$ | | | | |
| 8 | Mikael Torpegaard | 6 | 6 | | 8 | Mikael Torpegaard | 6 | 7$^7$ | | | | |
| 2 | Yasutaka Uchiyama | 3 | 3 | | | | | | | | | |

### Top half
#### Section 1

| 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 |
| | | | | 1 | M Mmoh | 2 | 2$^r$ | | | | | | | | |
| Q | A González | 6 | 6 | Q | A González | 6 | 1 | | | | | | | | |
| WC | N Mejía | 2 | 4 | | | | | | Q | A González | 4 | 2 | | | |
| WC | C Kingsley | 5 | 4 | | | | | | | J-s Nam | 6 | 6 | | | |
| | J-s Nam | 7 | 6 | | J-s Nam | 6 | 3 | 6 | | | | | | | |
| | | | | 14 | J. J. Wolf | 4 | 6 | 4 | | | | | | | |
| | | | | | | | | | | | | | J-s Nam | 6 | 6 |
| | | | | | | | | | | | | | Zh Zhang | 3 | 2 |
| | | | | 10 | Z Li | 4 | 4 | | | | | | | | |
| | Zh Zhang | 6 | 6 | | Zh Zhang | 6 | 6 | | | | | | | | |
| Alt | H Heliövaara | 3 | 4 | | | | | | | Zh Zhang | 6 | 6 | | | |
| ITF | F Cerúndolo | 6 | 6 | | | | | | ITF | F Cerúndolo | 4 | 4 | | | |
| | F Mena | 4 | 1 | ITF | F Cerúndolo | 6 | 6$^9$ | 6 | | | | | | | |
| | | | | 7 | R Quiroz | 1 | 7$^{11}$ | 0 | | | | | | | |

#### 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | D Young | 6$^6$ | 2 | | | | | | | | | | |
| Q | D Novikov | 6 | 6 | | Q | D Novikov | 7$^8$ | 6 | | | | | | | | | | |
| | Mi Redlicki | 4 | 3 | | | | | | | Q | D Novikov | 2 | 1$^r$ | | | | | |
| | V Millot | 2 | 1$^r$ | | | | | | | 16 | J Menezes | 6 | 4 | | | | | |
| | A Sarkissian | 6 | 4 | | | A Sarkissian | 3 | 7$^7$ | 3 | | | | | | | | | |
| | | | | | 16 | J Menezes | 6 | 6$^5$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 16 | J Menezes | 6 | 3 | 1 |
| | | | | | | | | | | | | | | 6 | D Sela | 4 | 6 | 6 |
| | | | | | 11 | D-h Lee | 6 | 7 | | | | | | | | | | |
| ITF | O Luz | 5 | 7$^7$ | 5 | WC | J McNally | 3 | 5 | | | | | | | | | | |
| WC | J McNally | 7 | 6$^4$ | 7 | | | | | | 11 | D-h Lee | 3 | 1 | | | | | |
| | R Shane | 6$^4$ | 6$^3$ | | | | | | | 6 | D Sela | 6 | 6 | | | | | |
| | MF Descotte | 7$^7$ | 7$^7$ | | | MF Descotte | 3 | 3 | | | | | | | | | | |
| | | | | | 6 | D Sela | 6 | 6 | | | | | | | | | | |

### Bottom half
#### Section 3

| 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 |
| | | | | | LL | A Kovacevic | 4 | 6 | 5 | | | | | | | | | | |
| | M Cressy | 6 | 3 | 4 | | T Seyboth Wild | 6 | 3 | 7 | | | | | | | | | | |
| | T Seyboth Wild | 0 | 6 | 6 | | | | | | | T Seyboth Wild | 6 | 5 | 2 | | | | | |
| PR | D Nguyen | 6 | 6$^5$ | 7 | | | | | | 12 | T-S Kwiatkowski | 3 | 7 | 6 | | | | | |
| ITF | G Brouwer | 4 | 7$^7$ | 5 | PR | D Nguyen | 6 | 2 | 4 | | | | | | | | | | |
| | | | | | 12 | T-S Kwiatkowski | 4 | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 12 | T-S Kwiatkowski | 2 | 6 | 6 |
| | | | | | | | | | | | | | | | 3 | E Gómez | 6 | 0 | 3 |
| | | | | | 15 | C Altamirano | 6 | 6 | | | | | | | | | | | |
| WC | J Trotter | 7$^7$ | 6 | | WC | J Trotter | 3 | 1 | | | | | | | | | | | |
| | Roy Smith | 6$^3$ | 3 | | | | | | | 15 | C Altamirano | 5 | 7 | 0 | | | | | |
| | A Galarneau | 6$^4$ | 6 | 6 | | | | | | 3 | E Gómez | 7 | 5 | 6 | | | | | |
| WC | J Boulais | 7$^7$ | 4 | 0 | | A Galarneau | 1 | 3 | | | | | | | | | | | |
| | | | | | 3 | E Gómez | 6 | 6 | | | | | | | | | | | |

#### Section 4

| 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 |
| | | | | 8 | M Torpegaard | 6 | 7 | | | | | | | | | | |
| ITF | N Álvarez | 6$^6$ | 6$^5$ | PR | R Sarmiento | 4 | 5 | | | | | | | | | | |
| PR | R Sarmiento | 7$^8$ | 7$^7$ | | | | | | 8 | M Torpegaard | 6 | 6 | | | | | |
| | Z Piros | 6 | 7 | | | | | | 9 | T Smyczek | 2 | 1 | | | | | |
| | Makoto Ochi | 4 | 5 | | Z Piros | 3 | 6 | 2 | | | | | | | | | |
| | | | | 9 | T Smyczek | 6 | 4 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 8 | M Torpegaard | 6 | 6 |
| | | | | | | | | | | | | | | 2 | Y Uchiyama | 3 | 3 |
| | | | | 13 | F Peliwo | 3 | 4 | | | | | | | | | | |
| PR | C Gómez-Herrera | 6 | 7$^7$ | PR | C Gómez-Herrera | 6 | 6 | | | | | | | | | | |
| | I Marchenko | 1 | 6$^4$ | | | | | | PR | C Gómez-Herrera | 6 | 3 | 4 | | | | |
| | Jared Hiltzik | 3 | 2 | | | | | | 2 | Y Uchiyama | 3 | 6 | 6 | | | | |
| | Evan Song | 6 | 6 | | E Song | 7$^9$ | 6$^4$ | 4 | | | | | | | | | |
| | | | | 2 | Y Uchiyama | 6$^7$ | 7$^7$ | 6 | | | | | | | | | |