# 2018 Open Castilla y León – Men's singles

Jaume Munar was the defending champion but chose not to defend his title.
Ugo Humbert won the title after defeating Adrián Menéndez Maceiras 6–3, 6–4 in the final.

## Seeds

* Sergiy Stakhovsky (first round)
* Adrián Menéndez Maceiras (final)
* Luca Vanni (semifinals)
* Andrea Arnaboldi (semifinals)
* Scott Griekspoor (first round)
* Daniel Brands (quarterfinals)
* Ugo Humbert (champion)
* Tallon Griekspoor (withdrew)

## 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

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 7 | Ugo Humbert | 7$^7$ | 6 | | | | |
| 3 | Luca Vanni | 6$^5$ | 4 | | | | |
| 3 | Luca Vanni | 6$^5$ | 4 | 7 | Ugo Humbert | 6 | 6 |
| | | | | 2 | Adrián Menéndez Maceiras | 3 | 4 |
| 4 | Andrea Arnaboldi | 6$^6$ | 6$^5$ | 2 | Adrián Menéndez Maceiras | 3 | 4 |
| 2 | Adrián Menéndez Maceiras | 7$^8$ | 7$^7$ | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | S Stakhovsky | 3 | 6 | 6$^5$ | | | | | | | | | | | | | | |
| | M Viola | 6 | 2 | 7$^7$ | | M Viola | 5 | 5 | | | | | | | | | | |
| | R Quiroz | 4 | 6 | 6 | | R Quiroz | 7 | 7 | | | | | | | | | | |
| | Carlos Boluda-Purkiss | 6 | 4 | 4 | | | | | | | R Quiroz | 2 | 7 | 6$^7$ | | | | |
| | Christopher Heyman | 4 | 4 | | | | | | | 7 | U Humbert | 6 | 5 | 7$^9$ | | | | |
| | João Monteiro | 6 | 6 | | | J Monteiro | 1 | 3 | | | | | | | | | | |
| | R Ortega Olmedo | 6 | 3 | 2 | 7 | U Humbert | 6 | 6 | | | | | | | | | | |
| 7 | U Humbert | 4 | 6 | 6 | | | | | | | | | | | 7 | U Humbert | 7$^7$ | 6 |
| 3 | L Vanni | 6 | 4 | 6 | | | | | | | | | | | 3 | L Vanni | 6$^5$ | 4 |
| WC | A Davidovich Fokina | 1 | 6 | 4 | 3 | L Vanni | 6 | 3 | 6 | | | | | | | | | |
| | C Gómez-Herrera | 6$^6$ | 6$^3$ | | | F Baldi | 4 | 6 | 4 | | | | | | | | | |
| | F Baldi | 7$^8$ | 7$^7$ | | | | | | | 3 | L Vanni | 6 | 6 | | | | | |
| | GM Moroni | 6 | 6 | | | | | | | | GM Moroni | 1 | 4 | | | | | |
| | D Guez | 3 | 2 | | | GM Moroni | 6 | 6$^1$ | 6 | | | | | | | | | |
| | I Nedelko | 6 | 6 | | | I Nedelko | 4 | 7$^7$ | 3 | | | | | | | | | |
| Q | K-M Maamoun | 3 | 4 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | D Brands | 6 | 6 | | | | | | | | | | | | | | |
| Q | A Romero de Ávila Senise | 4 | 2 | | 6 | D Brands | 6 | 6 | | | | | | | | | |
| Q | HN Lý | 6 | 6 | | Q | HN Lý | 2 | 4 | | | | | | | | | |
| LL | S Doumbia | 2 | 1 | | | | | | 6 | D Brands | 6 | 3 | 6$^5$ | | | | |
| | T Brkić | 5 | 3 | | | | | | 4 | A Arnaboldi | 4 | 6 | 7$^7$ | | | | |
| | A Šetkić | 7 | 6 | | | A Šetkić | 3 | 3 | | | | | | | | | |
| WC | Miguel Semmler | 6 | 5 | 5 | 4 | A Arnaboldi | 6 | 6 | | | | | | | | | |
| 4 | A Arnaboldi | 4 | 7 | 7 | | | | | | | | | | 4 | A Arnaboldi | 6$^6$ | 6$^5$ |
| 5 | S Griekspoor | 6 | 1 | 6$^3$ | | | | | | | | | | 2 | A Menéndez Maceiras | 7$^8$ | 7$^7$ |
| WC | A Artuñedo | 3 | 6 | 7$^7$ | WC | A Artuñedo | 6 | 5 | | | | | | | | | |
| | M Neuchrist | 6 | 7$^7$ | | | M Neuchrist | 1 | 2$^r$ | | | | | | | | | |
| | A Pavić | 3 | 6$^4$ | | | | | | WC | A Artuñedo | 6$^3$ | 6$^6$ | | | | | |
| | C İlkel | 6 | 6 | | | | | | 2 | A Menéndez Maceiras | 7$^7$ | 7$^8$ | | | | | |
| WC | Jorge Hernando Ruano | 4 | 3 | | | C İlkel | 0 | 2 | | | | | | | | | |
| Q | Y Jankovits | 4 | 2 | | 2 | A Menéndez Maceiras | 6 | 6 | | | | | | | | | |
| 2 | A Menéndez Maceiras | 6 | 6 | | | | | | | | | | | | | | |