# 2019 San Luis Open Challenger Tour – Singles

Marcelo Arévalo was the defending champion but lost in the second round to Marcelo Tomás Barrios Vera.
Marc-Andrea Hüsler won the title after defeating Adrián Menéndez Maceiras 7–5, 7–6$^{(7–3)}$ in the final.

## Seeds

All seeds receive a bye into the second round.
* Alexander Bublik (third round)
* Adrián Menéndez Maceiras (final)
* Dustin Brown (second round)
* Sebastian Ofner (second round)
* Mirza Bašić (second round)
* Roberto Quiroz (third round)
* Peđa Krstin (second round)
* Mohamed Safwat (second round)
* John-Patrick Smith (second round)
* Blaž Rola (second round)
* Lucas Miedler (quarterfinals)
* Marcelo Arévalo (second round)
* Scott Griekspoor (second round)
* Roberto Ortega Olmedo (second round)
* Roberto Cid Subervi (second round)
* Danilo Petrović (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 |
| Alt | Pedro Sakamoto | 2 | 6 | 6 | | | | | | | | | |
| | Marcelo Tomás Barrios Vera | 6 | 1 | 4 | | | | | | | | | |
| | Marcelo Tomás Barrios Vera | 6 | 1 | 4 | Alt | Pedro Sakamoto | 2 | 4 | | | | | |
| | | | | | | Marc-Andrea Hüsler | 6 | 6 | | | | | |
| | Marc-Andrea Hüsler | 4 | 7 | 6 | | Marc-Andrea Hüsler | 6 | 6 | | | | | |
| 11 | Lucas Miedler | 6 | 5 | 3 | | | | | | | | | |
| 11 | Lucas Miedler | 6 | 5 | 3 | | | | | | | Marc-Andrea Hüsler | 7 | 7$^7$ |
| | | | | | | | | | | 2 | Adrián Menéndez Maceiras | 5 | 6$^3$ |
| PR | Facundo Mena | 7$^7$ | 7$^7$ | | | | | | | | | | | 2 | Adrián Menéndez Maceiras | 5 | 6$^3$ |
| | Ante Pavić | 6$^5$ | 6$^4$ | | | | | | | | | | |
| | Ante Pavić | 6$^5$ | 6$^4$ | | PR | Facundo Mena | 6 | 3 | 5 | | | | |
| | | | | | 2 | Adrián Menéndez Maceiras | 4 | 6 | 7 | | | | |
| | Alexandre Müller | 0 | 2 | | 2 | Adrián Menéndez Maceiras | 4 | 6 | 7 | | | | |
| 2 | Adrián Menéndez Maceiras | 6 | 6 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | A Bublik | 6 | 6 | | | | | | | | | |
| | K King | 7$^9$ | 6$^4$ | 6 | | K King | 4 | 3 | | | | | | | | | |
| | E King | 6$^7$ | 7$^7$ | 3 | | | | | 1 | A Bublik | 3 | 5 | | | | | |
| | A Molčan | 4 | 2 | | | | | | Alt | P Sakamoto | 6 | 7 | | | | | |
| Alt | P Sakamoto | 6 | 6 | | Alt | P Sakamoto | 6 | 6 | | | | | | | | | |
| | | | | | 14 | R Ortega Olmedo | 4 | 2 | | | | | | | | | |
| | | | | | | | | | | | | | Alt | P Sakamoto | 2 | 6 | 6 |
| | | | | | | | | | | | | | | MT Barrios Vera | 6 | 1 | 4 |
| | | | | | 12 | M Arévalo | 4 | 4 | | | | | | | | | |
| | MT Barrios Vera | 6 | 6 | | | MT Barrios Vera | 6 | 6 | | | | | | | | | |
| | R Olivo | 4 | 2 | | | | | | | MT Barrios Vera | w/o | | | | | | |
| Q | G López Villaseñor | 5 | 7$^7$ | 3 | | | | | ITF | J Souza | | | | | | | |
| ITF | J Souza | 7 | 6$^4$ | 6 | ITF | J Souza | 6 | 6 | | | | | | | | | |
| | | | | | 8 | M Safwat | 3 | 4 | | | | | | | | | |

#### 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 | Quarterfinals |
| | | | | | 3 | D Brown | 6 | 2 | 4 | | | | | | | | | | |
| | JP Varillas | 5 | 3 | | | G Escobar | 4 | 6 | 6 | | | | | | | | | | |
| | G Escobar | 7 | 6 | | | | | | | | G Escobar | 4 | 7$^7$ | 4 | | | | | |
| | M-A Hüsler | 6 | 6 | | | | | | | | M-A Hüsler | 6 | 6$^5$ | 6 | | | | | |
| Q | S Verbeek | 1 | 4 | | | M-A Hüsler | 6 | 6 | | | | | | | | | | | |
| | | | | | 16 | D Petrović | 3 | 4 | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | M-A Hüsler | 4 | 7 | 6 |
| | | | | | | | | | | | | | | | 11 | L Miedler | 6 | 5 | 3 |
| | | | | | 11 | L Miedler | 7 | 3 | 6 | | | | | | | | | | |
| WC | J Tipsarević | 6 | 5 | 6 | WC | J Tipsarević | 5 | 6 | 3 | | | | | | | | | | |
| WC | L Gómez | 4 | 7 | 2 | | | | | | 11 | L Miedler | 6 | 6 | | | | | | |
| ITF | A Tabilo | 7$^7$ | 7 | | | | | | | 6 | R Quiroz | 4 | 4 | | | | | | |
| ITF | M Guinard | 6$^1$ | 5 | | ITF | A Tabilo | 4 | 6$^3$ | | | | | | | | | | | |
| | | | | | 6 | R Quiroz | 6 | 7$^7$ | | | | | | | | | | | |

### 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 |
| | | | | | 5 | M Bašić | 7 | 2 | 1 | | | | | | | | | |
| PR | C Gómez-Herrera | 7 | 6 | | PR | C Gómez-Herrera | 5 | 6 | 6 | | | | | | | | | |
| | M Zekić | 5 | 3 | | | | | | | PR | C Gómez-Herrera | 2 | 4 | | | | | |
| PR | F Mena | 4 | 6 | 6 | | | | | | PR | F Mena | 6 | 6 | | | | | |
| | Y Takahashi | 6 | 3 | 0 | PR | F Mena | 6 | 6 | | | | | | | | | | |
| | | | | | 10 | B Rola | 2 | 4 | | | | | | | | | | |
| | | | | | | | | | | | | | | | PR | F Mena | 7$^7$ | 7$^7$ |
| | | | | | | | | | | | | | | | | A Pavić | 6$^5$ | 6$^4$ |
| | | | | | 15 | R Cid Subervi | 3 | 6 | 3 | | | | | | | | | |
| | V Durasovic | 6 | 3 | 5 | | A Pavić | 6 | 1 | 6 | | | | | | | | | |
| | A Pavić | 4 | 6 | 7 | | | | | | | A Pavić | 6 | 4 | 7$^7$ | | | | |
| | V Estrella Burgos | 5 | 1 | | | | | | | | E Escobedo | 2 | 6 | 6$^5$ | | | | |
| | E Escobedo | 7 | 6 | | | E Escobedo | 7 | 2 | 6 | | | | | | | | | |
| | | | | | 4 | S Ofner | 5 | 6 | 4 | | | | | | | | | |

#### 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 |
| | | | | | 7 | P Krstin | 1 | 1 | | | | | | | | | | |
| | MF Descotte | 7$^9$ | 4 | 3 | ITF | J Menezes | 6 | 6 | | | | | | | | | | |
| ITF | J Menezes | 6$^7$ | 6 | 6 | | | | | | ITF | J Menezes | 6 | 3 | 4 | | | | |
| WC | N Mejía | 6$^5$ | 5 | | | | | | | | A Müller | 3 | 6 | 6 | | | | |
| | A Müller | 7$^7$ | 7 | | | A Müller | 6 | 4 | 7$^7$ | | | | | | | | | |
| | | | | | 9 | J-P Smith | 4 | 6 | 6$^5$ | | | | | | | | | |
| | | | | | | | | | | | | | | | | A Müller | 0 | 2 |
| | | | | | | | | | | | | | | | 2 | A Menéndez Maceiras | 6 | 6 |
| | | | | | 13 | S Griekspoor | 4 | 4 | | | | | | | | | | |
| ITF | Baptiste Crepatte | 3 | 6$^8$ | | Alt | T Seyboth Wild | 6 | 6 | | | | | | | | | | |
| Alt | T Seyboth Wild | 6 | 7$^{10}$ | | | | | | | Alt | T Seyboth Wild | 2 | 4 | | | | | |
| WC | M Sánchez | 6 | 7 | | | | | | | 2 | A Menéndez Maceiras | 6 | 6 | | | | | |
| WC | E Nava | 2 | 5 | | WC | M Sánchez | 6 | 1 | 2 | | | | | | | | | |
| | | | | | 2 | A Menéndez Maceiras | 3 | 6 | 6 | | | | | | | | | |