# Tennis at the 2018 Summer Youth Olympics – Boys' singles

These are the results for the boys' singles event at the 2018 Summer Youth Olympics.

## Seeds

* Tseng Chun-hsin (TPE) (quarterfinals)
* Sebastián Báez (ARG) (quarterfinals)
* Hugo Gaston (FRA) (gold medallist)
* Lorenzo Musetti (ITA) (first round)
* Nicolás Mejía (COL) (first round)
* Adrian Andreev (BUL) (semifinals, retired, fourth place)
* Gilbert Soares Klier Júnior (BRA) (semifinals, bronze medallist)
* Facundo Díaz Acosta (ARG) (final, silver medallist)

## Main 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 | Gold medal match | Gold medal match | Gold medal match | Gold medal match | Gold medal match |
| 8 | Facundo Díaz Acosta (ARG) | 6 | 6 | | | | | |
| 6 | Adrian Andreev (BUL) | 4 | 1 | | | | | |
| 6 | Adrian Andreev (BUL) | 4 | 1 | 8 | Facundo Díaz Acosta (ARG) | 4 | 5 | |
| | | | | 3 | Hugo Gaston (FRA) | 6 | 7 | |
| 3 | Hugo Gaston (FRA) | 6 | 6 | 3 | Hugo Gaston (FRA) | 6 | 7 | |
| 7 | Gilbert Soares Klier Júnior (BRA) | 4 | 1 | Bronze medal match | Bronze medal match | Bronze medal match | Bronze medal match | Bronze medal match |
| | | | | 6 | Adrian Andreev (BUL) | 4 | 1$^r$ | |
| | | | | 7 | Gilbert Soares Klier Júnior (BRA) | 6 | 3 | |
* Hugo Gaston (winner) during the gold medal match
* Facundo Díaz Acosta (runner-up) during the gold medal match
* Victory ceremony of the boys' singles

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | C-h Tseng (TPE) | 6 | 6 | | | | | | | | | | | | | | |
| | D Tashbulatov (KAZ) | 3 | 4 | | 1 | C-h Tseng (TPE) | 6 | 3 | 6 | | | | | | | | |
| | R Hijikata (AUS) | 6$^2$ | 6 | 0 | | T Mu (CHN) | 3 | 6 | 2 | | | | | | | | |
| | T Mu (CHN) | 7$^7$ | 2 | 6 | | | | | | 1 | C-h Tseng (TPE) | 2 | 4 | | | | |
| | J de Jong (NED) | 6 | 6 | | | | | | | 8 | F Díaz Acosta (ARG) | 6 | 6 | | | | |
| | A Dawani (BHR) | 2 | 1 | | | J de Jong (NED) | 6 | 4 | 3 | | | | | | | | |
| | P Henning (RSA) | 0 | 3 | | 8 | F Díaz Acosta (ARG) | 4 | 6 | 6 | | | | | | | | |
| 8 | F Díaz Acosta (ARG) | 6 | 6 | | | | | | | | | | | 8 | F Díaz Acosta (ARG) | 6 | 6 |
| 4 | L Musetti (ITA) | 4 | 4 | | | | | | | | | | | 6 | A Andreev (BUL) | 4 | 1 |
| | FC Jianu (ROU) | 6 | 6 | | | FC Jianu (ROU) | 6$^5$ | 6 | 7 | | | | | | | | |
| | C Tabur (FRA) | 7 | 3 | 6 | | C Tabur (FRA) | 7 | 4 | 6$^3$ | | | | | | | | |
| | D Svrčina (CZE) | 5 | 6 | 2 | | | | | | | FC Jianu (ROU) | 2 | 4 | | | | |
| | T Boyer (USA) | 3 | 6$^9$ | | | | | | | 6 | A Andreev (BUL) | 6 | 6 | | | | |
| | Y Erel (TUR) | 6 | 7$^{11}$ | | | Y Erel (TUR) | 3 | 7 | 3 | | | | | | | | |
| | C López Montagud (ESP) | 6$^4$ | 6 | 2 | 6 | A Andreev (BUL) | 6 | 5 | 6 | | | | | | | | |
| 6 | A Andreev (BUL) | 7$^7$ | 3 | 6 | | | | | | | | | | | | | |

### Bottom 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | N Mejía (COL) | 4 | 2 | | | | | | | | | | | | | | |
| | O Štyler (CZE) | 6 | 6 | | | O Štyler (CZE) | 2 | 0 | | | | | | | | | |
| | D N'tcha (BEN) | 0 | 0 | | | D Michalski (POL) | 6 | 6 | | | | | | | | | |
| | D Michalski (POL) | 6 | 6 | | | | | | | | D Michalski (POL) | 4 | 1 | | | | |
| | N Tajima (JPN) | 6 | 6 | | | | | | | 3 | H Gaston (FRA) | 6 | 6 | | | | |
| | A Bovy (BEL) | 4 | 2 | | | N Tajima (JPN) | 3 | 2 | | | | | | | | | |
| | N Hardt (DOM) | 2 | 1 | | 3 | H Gaston (FRA) | 6 | 6 | | | | | | | | | |
| 3 | H Gaston (FRA) | 6 | 6 | | | | | | | | | | | 3 | H Gaston (FRA) | 6 | 6 |
| 7 | G Soares Klier Júnior (BRA) | 6 | 4 | 6 | | | | | | | | | | 7 | G Soares Klier Júnior (BRA) | 4 | 1 |
| | M Miladinović (SRB) | 4 | 6 | 2 | 7 | G Soares Klier Júnior (BRA) | 7 | 6 | | | | | | | | | |
| | P Sydow (ARU) | 3 | 7$^7$ | 3 | | D Baird (USA) | 6$^7$ | 4 | | | | | | | | | |
| | D Baird (USA) | 6 | 6$^5$ | 6 | | | | | | 7 | G Soares Klier Júnior (BRA) | 6 | 6 | | | | |
| | D Wenger (SUI) | 3 | 3 | | | | | | | 2 | S Báez (ARG) | 4 | 4 | | | | |
| | N Álvarez Varona (ESP) | 6 | 6 | | | N Álvarez Varona (ESP) | 7 | 4 | 4 | | | | | | | | |
| | R Ho (TPE) | 4 | 1 | | 2 | S Báez (ARG) | 5 | 6 | 6 | | | | | | | | |
| 2 | S Báez (ARG) | 6 | 6 | | | | | | | | | | | | | | |