| Challenger Oeiras | 01/04 15:00 | 26 | [322] Thai-Son Kwiatkowski v Lorenzo Giustino [287] | 6-4,6-4 | |
| Challenger Oeiras | 01/01 17:20 | 25 | [287] Lorenzo Giustino v Michael Vrbensky [300] | 7-5,4-6,6-4 | |
| Challenger Maspalomas | 11/27 13:45 | 25 | [386] Gerard Campana Lee v Lorenzo Giustino [276] | 4-6,6-1,6-3 | |
| Challenger Valencia | 11/19 12:30 | 14 | Nicolas Alvarez Varona v Lorenzo Giustino | 6-4,6-4 | |
| ATP Sofia | 11/04 13:30 | 14 | [274] Lorenzo Giustino v Illya Marchenko [210] | 6-7,7-6,3-6 | |
| Challenger Shenzhen | 10/20 05:25 | 27 | [290] Lorenzo Giustino v Aleksandar Kovacevic [112] | 3-6,6-3,3-6 | |
| Challenger Shenzhen | 10/19 07:55 | 26 | [362] Colin Sinclair v Lorenzo Giustino [290] | 3-6,4-6 | |
| Challenger Shenzhen | 10/16 05:10 | 26 | [290] Lorenzo Giustino v Rigele Te [482] | 6-4,6-3 | |
| Challenger Shenzhen | 10/11 02:00 | 25 | [278] Lorenzo Giustino v Terence Atmane [148] | 6-7,3-6 | |
| ATP Shanghai | 10/02 05:55 | 14 | [344] Benjamin Lock v Lorenzo Giustino [279] | 7-6,3-6,6-4 | |
| ATP Zhuhai | 09/19 04:30 | 14 | [281] Lorenzo Giustino v Alex Bolt [323] | 4-6,3-6 | |
| Challenger Guangzhou | 09/12 03:50 | 25 | [279] Lorenzo Giustino v Terence Atmane [173] | 0-6,6-4,3-6 | |
| Challenger Shanghai | 09/08 05:50 | 27 | [296] Lorenzo Giustino v Juncheng Shang [178] | 1-6,4-6 | |
| Challenger Shanghai | 09/07 03:00 | 26 | [214] Yunchaokete Bu v Lorenzo Giustino [296] | 1-6,4-6 | |
| Challenger Shanghai | 09/05 03:00 | 25 | [346] Hiroki Moriya v Lorenzo Giustino [296] | 1-6,2-6 | |
| Challenger Zhangjiagang | 08/31 06:20 | 26 | [296] Lorenzo Giustino v James McCabe [281] | 4-6,6-3,1-6 | |
| Challenger Zhangjiagang | 08/30 04:45 | 25 | Leonid Sheyngezikht v Lorenzo Giustino | 4-6,1-6 | |
| Challenger Praga | 08/23 09:45 | 26 | [425] Federico Agustin Gomez v Lorenzo Giustino [300] | 6-3,6-3 | |
| Challenger Praga | 08/21 11:50 | 25 | [300] Lorenzo Giustino v Filip Cristian Jianu [348] | 6-4,6-3 | |
| Challenger Todi | 08/15 16:35 | 25 | [301] Lorenzo Giustino v Mathys Erhard [310] | 6-7,0-6 | |
| Challenger Todi | 08/15 13:20 | 25 | Lorenzo Giustino v Camilo Ugo Carabelli | Cancelled | |
| Challenger Porto | 08/01 14:50 | 25 | [162] Antoine Escoffier v Lorenzo Giustino [290] | 6-3,6-4 | |
| Challenger Pozoblanco | 07/18 07:30 | 25 | Lorenzo Giustino v Edas Butvilas | 1-6,2-6 | |
| Challenger Salzburg | 07/10 10:30 | 19 | [258] Lorenzo Giustino v Sandro Kopp [453] | 0-6,2-6 | |
| Challenger Troyes | 07/07 15:30 | 27 | Calvin Hemery v Lorenzo Giustino | 6-4,4-6,6-1 | |
| Challenger Troyes | 07/06 11:00 | 26 | [331] Lucas Gerch v Lorenzo Giustino [258] | 3-6,6-3,3-6 | |
| Challenger Troyes | 07/05 10:05 | 25 | [295] Valentin Royer v Lorenzo Giustino [258] | 4-6,4-6 | |
| Challenger Modena | 06/26 17:40 | 25 | [256] Lorenzo Giustino v Nerman Fatic [251] | 6-7,2-6 | |
| Challenger Poznań | 06/20 08:30 | 25 | [117] Facundo D Acosta v Lorenzo Giustino [255] | 3-6,6-2,6-4 | |
| Challenger Perugia | 06/12 13:30 | 25 | [313] Pol M Tiffon v Lorenzo Giustino [250] | 6-3,6-3 |
Lorenzo Giustino (ur. 10 września 1991 w Neapolu) – włoski tenisista.