| Challenger Biella | 02/11 10:30 | 26 | [182] Roberto Marcora v Lorenzo Giustino [157] | 6-7,5-7 | |
| Challenger Biella | 02/09 16:25 | 25 | [337] Jelle Sels v Lorenzo Giustino [157] | 4-6,3-6 | |
| Challenger Antalya | 02/01 13:50 | 25 | [118] Thiago Seyboth Wild v Lorenzo Giustino [154] | 6-4,6-3 | |
| Challenger Antalya | 01/28 08:40 | 25 | [224] Zdenek Kolar v Lorenzo Giustino [154] | 6-3,3-6,7-5 | |
| Challenger Istanbul | 01/21 07:00 | 26 | [151] Lorenzo Giustino v Antoine Hoang [121] | 4-6,4-6 | |
| Challenger Istanbul | 01/18 11:25 | 25 | [151] Lorenzo Giustino v Alessandro Giannessi [162] | 7-5,7-6 | |
| Australian Open | 01/12 07:30 | 15 | [223] Borna Gojo v Lorenzo Giustino [151] | 6-3,7-6 | |
| Australian Open | 01/10 07:30 | 60 | [183] Denis Istomin v Lorenzo Giustino [151] | 1-6,1-6 | |
| Challenger Maia | 11/30 12:45 | 25 | [374] Duje Ajdukovic v Lorenzo Giustino [149] | 7-5,6-2 | |
| Challenger Bratislava | 11/12 13:10 | 26 | [316] Lukas Klein v Lorenzo Giustino [147] | 6-4,6-3 | |
| Challenger Bratislava | 11/10 09:00 | 25 | [169] Yannick Maden v Lorenzo Giustino [147] | 5-7,6-3,4-6 | |
| Challenger Marbella | 10/29 15:15 | 26 | [146] Lorenzo Giustino v Jaume Munar [108] | 1-6,3-6 | |
| Challenger Marbella | 10/27 11:30 | 25 | [136] Carlos Alcaraz v Lorenzo Giustino [145] | 6-3,5-7,4-6 | |
| Challenger Istanbul | 10/19 08:30 | 25 | [336] Altug Celikbilek v Lorenzo Giustino [140] | 6-0,6-3 | |
| Challenger Alicante | 10/12 12:15 | 25 | [203] Liam Broady v Lorenzo Giustino [140] | 7-5,6-3 | |
| Challenger Barcellona | 10/08 12:55 | 26 | [157] Lorenzo Giustino v Filip Horansky [177] | 3-6,6-3,2-6 | |
| Challenger Barcellona | 10/06 11:30 | 25 | [223] Francisco Cerundolo v Lorenzo Giustino [157] | 1-6,4-6 | |
| Open di Francia | 09/30 11:45 | 24 | [157] Lorenzo Giustino v Diego Schwartzman [14] | 1-6,5-7,0-6 | |
| Open di Francia | 09/27 17:10 | 23 | [70] Corentin Moutet v Lorenzo Giustino [156] | 6-0,6-7,6-7,6-2,16-18 | |
| Open di Francia | 09/24 11:00 | 19 | [246] Dustin Brown v Lorenzo Giustino [156] | 3-6,5-7 | |
| Open di Francia | 09/23 13:05 | 15 | [156] Lorenzo Giustino v Hugo Grenier [249] | 3-6,6-4,7-5 | |
| Open di Francia | 09/21 08:00 | 14 | [155] Lorenzo Giustino v Maximilian Marterer [263] | 6-3,5-7,7-6 | |
| Challenger Prostejov | 09/09 11:10 | 26 | [56] Pablo Andujar v Lorenzo Giustino [154] | Retired | |
| Challenger Prostejov | 09/07 11:10 | 25 | [148] Daniel Elahi Galan v Lorenzo Giustino [154] | 6-2,3-6,4-6 | |
| Challenger Cordenons | 09/02 12:00 | 25 | [170] Mario Vilella Martinez v Lorenzo Giustino [154] | 6-4,2-6,6-4 | |
| Challenger Trieste | 08/24 14:00 | - | [152] Lorenzo Giustino v Matteo Viola [222] | 4-6,2-6 | |
| Challenger Todi | 08/17 12:30 | - | [153] Lorenzo Giustino v Daniel Altmaier [219] | 6-3,3-6,2-6 | |
| Spagna - Lega estiva | 07/17 12:20 | - | [153] Lorenzo Giustino v Javier Barranco Cosano [296] | 6-7,1-6 | |
| Spagna - Lega estiva | 07/16 15:00 | - | [153] Lorenzo Giustino v Eduard Esteve Lobato [465] | Retired | |
| Italian National Tour | 07/02 16:00 | 1 | [153] Lorenzo Giustino v Carlos Taberner [175] | 4-6,6-3,2-6 |
Lorenzo Giustino (Napoli, 10 settembre 1991) è un tennista italiano.