| Challenger - Alicante | 04/04 11:35 | 26 | [246] Lorenzo Giustino v Marco Cecchinato [99] | 3-6,5-7 | |
| Challenger - Alicante | 04/03 10:55 | 25 | [246] Lorenzo Giustino v Carlos Taberner [186] | Retired | |
| ITF Italy F5 | 04/01 12:00 | 29 | [243] Lorenzo Giustino v Martin Cuevas [308] | 7-5,7-5 | |
| ITF Italy F5 | 03/31 12:00 | 28 | [243] Lorenzo Giustino v Miljan Zekic [315] | 6-4,6-0 | |
| ITF Italy F5 | 03/30 14:35 | 27 | Lorenzo Giustino v Bogdan Ionut Apostol | 2-6,6-1,7-6 | |
| ITF Italy F5 | 03/29 16:35 | 26 | Lorenzo Giustino v Paul Woerner | 4-6,6-3,7-5 | |
| ITF Italy F5 | 03/28 12:00 | 25 | Lorenzo Giustino v Yan Sabanin | 6-3,7-5 | |
| Challenger - Lille | 03/20 11:50 | 25 | [254] Laurynas Grigelis v Lorenzo Giustino [243] | 6-4,7-6 | |
| Challenger - Lille | 03/20 11:30 | 25 | Mats Moraing v Lorenzo Giustino | 0-0 | |
| ITF Italy F3 | 03/16 13:00 | 27 | Andrea Basso v Lorenzo Giustino | 5-7,7-5,6-4 | |
| ITF Italy F3 | 03/15 13:00 | 26 | Billy Harris v Lorenzo Giustino | 2-6,3-6 | |
| ITF Italy F3 | 03/13 15:00 | 25 | Georg Winkler v Lorenzo Giustino | 3-6,2-6 | |
| ITF Italy F2 | 03/10 11:00 | 28 | Lorenzo Giustino v Attila Balazs | 6-7,6-4,4-6 | |
| ITF Italy F2 | 03/09 16:45 | 27 | Wilson Leite v Lorenzo Giustino | 2-6,0-6 | |
| ITF Italy F2 | 03/09 13:25 | 26 | Alexander Weis v Lorenzo Giustino | 2-6,4-6 | |
| ITF Italy F2 | 03/08 12:30 | 25 | Horst Rieder v Lorenzo Giustino | 3-6,0-6 | |
| ITF Spain F3 | 02/04 09:00 | 28 | Lorenzo Giustino v Daniel Gimeno-Traver | 6-7,5-7 | |
| ITF Spain F3 | 02/03 13:10 | 27 | Lorenzo Giustino v Pol Toledo Bague | 6-1,1-6,6-1 | |
| ITF Spain F3 | 01/31 11:45 | 26 | Lorenzo Giustino v Oleg Prihodko | Retired | |
| ITF Spain F3 | 01/30 10:35 | 25 | Lorenzo Giustino v Guy Den Heijer | 6-7,6-4,6-2 | |
| ITF Spain F2 | 01/28 10:50 | 29 | Daniel M. D L Nava v Lorenzo Giustino | 6-4,5-7,6-3 | |
| ITF Spain F2 | 01/27 10:00 | 28 | Ivan Gakhov v Lorenzo Giustino | 1-6,2-6 | |
| ITF Spain F2 | 01/26 13:30 | 27 | Daniel Gimeno-Traver v Lorenzo Giustino | 4-6,5-7 | |
| ITF Spain F2 | 01/25 09:00 | 26 | Francisco Cabral v Lorenzo Giustino | 1-6,3-6 | |
| ITF Spain F2 | 01/23 10:45 | 25 | Marc Fornell-Mestres v Lorenzo Giustino | 3-6,2-6 | |
| Australian Open Qual | 01/10 05:00 | 44 | Vasek Pospisil v Lorenzo Giustino | 7-5,7-6 | |
| ITF Greece F8 | 11/07 09:35 | 25 | Zsombor Piros v Lorenzo Giustino | 6-3,6-3 | |
| ITF Italy F35 | 10/26 13:00 | 27 | Andrea Vavassori v Lorenzo Giustino | 4-6,6-2,6-2 | |
| ITF Italy F35 | 10/25 17:25 | 26 | Walter Trusendi v Lorenzo Giustino | 7-6,0-6,6-7 | |
| ITF Italy F35 | 10/23 18:25 | 25 | Raul Brancaccio v Lorenzo Giustino | 6-7,2-6 |
Lorenzo Giustino (Italian pronunciation: [loˈrɛntso dʒuˈstiːno]; born 10 September 1991, in Naples) is an Italian tennis player.
Giustino has a career-high ATP singles ranking of 127 achieved on 12 August 2019 and a career-high ATP doubles ranking of 311 achieved on 15 April 2019.
Giustino made his ATP main draw debut at the 2015 BRD Năstase Țiriac Trophy, where he qualified for the main draw.
Giustino made his Grand Slam debut at the 2020 Australian Open. He defeated Frenchman Corentin Moutet 0–6, 7–6 (7), 7–6 (3), 2–6, 18–16 in the first round of 2020 French Open as a first time main draw qualifier at this Major. The match was the second-longest in French Open history, lasting 6 hours, 5 minutes. It was his first ATP tour-level win.
He qualified for his first ATP 500 tournament at the 2021 Dubai Tennis Championships as a lucky loser receiving a bye into the second round after the withdrawal of tenth seed Borna Ćorić.
He qualified for his second ATP 500 at the 2023 Barcelona Open Banc Sabadell.