# 2019 AON Open Challenger – Singles

Lorenzo Sonego was the defending champion and successfully defended his title, defeating Alejandro Davidovich Fokina 6–2, 4–6, 7–6$^{(8–6)}$ in the final.

## Seeds

All seeds receive a bye into the second round.
* Lorenzo Sonego (champion)
* Albert Ramos Viñolas (semifinals)
* Marco Cecchinato (second round)
* Philipp Kohlschreiber (quarterfinals)
* Roberto Carballés Baena (second round)
* Stefano Travaglia (quarterfinals)
* Jaume Munar (third round)
* Thiago Monteiro (quarterfinals)
* Salvatore Caruso (second round)
* Guido Andreozzi (semifinals)
* Alejandro Davidovich Fokina (final)
* Lorenzo Giustino (second round)
* Attila Balázs (third round)
* Taro Daniel (quarterfinals)
* Kimmer Coppejans (second round)
* Jiří Veselý (third 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1/WC | Lorenzo Sonego | 6 | 6 | | | | | | | | | | |
| 6 | Stefano Travaglia | 2 | 4 | | | | | | | | | | |
| 6 | Stefano Travaglia | 2 | 4 | 1/WC | Lorenzo Sonego | 6 | 5 | 6 | | | | | |
| | | | | 10 | Guido Andreozzi | 2 | 7 | 4 | | | | | |
| 4/WC | Philipp Kohlschreiber | 6$^6$ | 3 | 10 | Guido Andreozzi | 2 | 7 | 4 | | | | | |
| 10 | Guido Andreozzi | 7$^8$ | 6 | | | | | | | | | | |
| 10 | Guido Andreozzi | 7$^8$ | 6 | | | | | | 1/WC | Lorenzo Sonego | 6 | 4 | 7$^8$ |
| | | | | | | | | | 11 | Alejandro Davidovich Fokina | 2 | 6 | 6$^6$ |
| 11 | Alejandro Davidovich Fokina | 6 | 6 | | | | | | | | | | | 11 | Alejandro Davidovich Fokina | 2 | 6 | 6$^6$ |
| 14 | Taro Daniel | 4 | 4 | | | | | | | | | | |
| 14 | Taro Daniel | 4 | 4 | 11 | Alejandro Davidovich Fokina | 3 | 6 | 6 | | | | | |
| | | | | 2 | Albert Ramos Viñolas | 6 | 2 | 3 | | | | | |
| 8 | Thiago Monteiro | 2 | 4 | 2 | Albert Ramos Viñolas | 6 | 2 | 3 | | | | | |
| 2 | Albert Ramos Viñolas | 6 | 6 | | | | | | | | | | |

### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1/WC | L Sonego | 6 | 6 | | | | | | | | | | |
| Q | A Vavassori | 6 | 5 | 1 | | Y Hanfmann | 1 | 3 | | | | | | | | | | |
| | Y Hanfmann | 4 | 7 | 6 | | | | | | 1/WC | L Sonego | 6$^6$ | 7$^7$ | 7 | | | | |
| | A Tabilo | 6 | 6 | | | | | | | 16 | J Veselý | 7$^8$ | 6$^0$ | 5 | | | | |
| | J Choinski | 0 | 2 | | | A Tabilo | 5 | 1 | | | | | | | | | | |
| | | | | | 16 | J Veselý | 7 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 1/WC | L Sonego | 6 | 6 |
| | | | | | | | | | | | | | | | 6 | S Travaglia | 2 | 4 |
| | | | | | 12 | L Giustino | 3 | 2 | | | | | | | | | | |
| | S Nagal | 1 | 5 | | WC | G Zeppieri | 6 | 6 | | | | | | | | | | |
| WC | G Zeppieri | 6 | 7 | | | | | | | WC | G Zeppieri | 2 | 2 | | | | | |
| | T Robredo | 2 | 6$^4$ | | | | | | | 6 | S Travaglia | 6 | 6 | | | | | |
| | F Bagnis | 6 | 7$^7$ | | | F Bagnis | 6 | 3 | 3 | | | | | | | | | |
| | | | | | 6 | S Travaglia | 3 | 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4/WC | P Kohlschreiber | 6 | 6 | | | | | | | | | |
| | F Horanský | 3 | 4 | | WC | L Musetti | 4 | 4 | | | | | | | | | |
| WC | L Musetti | 6 | 6 | | | | | | | 4/WC | P Kohlschreiber | 7 | 7 | | | | |
| | J Menezes | 0 | 4 | | | | | | | | B Zapata Miralles | 5 | 5 | | | | |
| | B Zapata Miralles | 6 | 6 | | | B Zapata Miralles | 6 | 6 | | | | | | | | | |
| | | | | | 15 | K Coppejans | 2 | 4 | | | | | | | | | |
| | | | | | | | | | | | | | | 4/WC | P Kohlschreiber | 6$^6$ | 3 |
| | | | | | | | | | | | | | | 10 | G Andreozzi | 7$^8$ | 6 |
| | | | | | 10 | G Andreozzi | 4 | 6 | 6 | | | | | | | | |
| | S Ofner | 6 | 6 | | | S Ofner | 6 | 3 | 0 | | | | | | | | |
| | G García López | 2 | 2 | | | | | | | 10 | G Andreozzi | 6 | 7 | | | | |
| | R Molleker | 7 | 2 | 1 | | | | | | | F Baldi | 3 | 5 | | | | |
| | F Baldi | 5 | 6 | 6 | | F Baldi | 7$^7$ | 1 | 6 | | | | | | | | |
| | | | | | 5 | R Carballés Baena | 6$^4$ | 6 | 1 | | | | | | | | |

### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 7 | J Munar | 3 | 7$^7$ | 6 | | | | | | | | | |
| J Domingues | 6 | 1 | 2 | | C Berlocq | 6 | 6$^1$ | 4 | | | | | | | | | |
| C Berlocq | 4 | 6 | 6 | | | | | | 7 | J Munar | 6 | 4 | 3 | | | | |
| A Giannessi | 0 | 0$^r$ | | | | | | | 11 | A Davidovich Fokina | 4 | 6 | 6 | | | | |
| V Galović | 6 | 2 | | | V Galović | 0 | 4 | | | | | | | | | | |
| | | | | 11 | A Davidovich Fokina | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 11 | A Davidovich Fokina | 6 | 6 |
| | | | | | | | | | | | | | | 14 | T Daniel | 4 | 4 |
| | | | | 14 | T Daniel | 6 | 5 | 6 | | | | | | | | | |
| M Safwat | 4 | 6 | 6 | | M Safwat | 3 | 7 | 4 | | | | | | | | | |
| F Argüello | 6 | 2 | 0 | | | | | | 14 | T Daniel | 7$^7$ | 6 | | | | | |
| F Coria | 6 | 7 | | | | | | | | F Coria | 6$^5$ | 4 | | | | | |
| E Benchetrit | 1 | 5 | | | F Coria | 7$^7$ | 3 | 6 | | | | | | | | | |
| | | | | 3 | M Cecchinato | 6$^4$ | 6 | 4 | | | | | | | | | |

#### 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 | T Monteiro | 6 | 6 | | | | | | | | | | |
| | R Dutra Silva | 2 | 3$^r$ | WC | A Pellegrino | 3 | 4 | | | | | | | | | | |
| WC | A Pellegrino | 6 | 4 | | | | | | 8 | T Monteiro | 4 | 6 | 6 | | | | |
| Alt | J Lenz | 5 | 4 | | | | | | | G Mager | 6 | 4 | 4 | | | | |
| | G Mager | 7 | 6 | | G Mager | 7$^7$ | 6 | | | | | | | | | | |
| | | | | 9 | S Caruso | 6$^4$ | 2 | | | | | | | | | | |
| | | | | | | | | | | | | | | 8 | T Monteiro | 2 | 4 |
| | | | | | | | | | | | | | | 2 | A Ramos Viñolas | 6 | 6 |
| | | | | 13 | A Balázs | 3 | 6 | 6 | | | | | | | | | |
| Q | A Molčan | 6 | 7 | Q | A Molčan | 6 | 3 | 3 | | | | | | | | | |
| Alt | T Bellucci | 4 | 5 | | | | | | 13 | A Balázs | 1 | 3 | | | | | |
| | F Gaio | 7 | 7$^7$ | | | | | | 2 | A Ramos Viñolas | 6 | 6 | | | | | |
| | P Cachin | 5 | 6$^4$ | | F Gaio | 4 | 6 | 2 | | | | | | | | | |
| | | | | 2 | A Ramos Viñolas | 6 | 4 | 6 | | | | | | | | | |