| Bergamo, Italy | 02/22 19:00 | 27 | Quinzi, Gianluigi v Jannik Sinner | 2-6,3-6 | |
| Bergamo, Italy | 02/21 19:00 | 26 | [151] Quinzi, Gianluigi v Elliot Benchetrit [281] | 7-6,6-2 | |
| Bergamo, Italy | 02/19 19:45 | 25 | [151] Quinzi, Gianluigi v Roman Safiullin [318] | 6-3,4-6,7-6 | |
| Challenger - Cherbourg | 02/14 11:25 | 26 | [159] Oscar Otte v Quinzi, Gianluigi [153] | 7-6,6-1 | |
| Challenger - Cherbourg | 02/13 11:20 | 25 | [228] Gian Marco Moroni v Quinzi, Gianluigi [153] | 2-6,2-6 | |
| ATP - Cordoba | 02/03 18:30 | 164 | [277] Pedro Cachin v Quinzi, Gianluigi [152] | 6-3,7-5 | |
| ATP - Cordoba | 02/02 20:30 | 64 | [305] Andrea Collarini v Quinzi, Gianluigi [152] | 6-4,4-6,1-6 | |
| Challenger - Punta del Este | 01/25 20:35 | 27 | [126] Thiago Monteiro v Quinzi, Gianluigi [154] | 7-5,7-5 | |
| Challenger - Punta del Este | 01/24 17:40 | 26 | [184] Martin, Andrej v Quinzi, Gianluigi [154] | 4-6,7-6,3-6 | |
| Challenger - Punta del Este | 01/23 19:25 | 25 | [351] Varillas, Juan Pablo v Quinzi, Gianluigi [154] | 7-6,6-7,4-6 | |
| Open d'Australie | 01/08 02:05 | 44 | [126] Miomir Kecmanovic v Quinzi, Gianluigi [155] | 6-4,3-6,6-3 | |
| ATP Pune | 12/30 09:40 | 164 | [109] Felix Auger Aliassime v Quinzi, Gianluigi [146] | 7-5,6-3 | |
| ATP Pune | 12/29 09:25 | 64 | [336] Mukund, S. v Quinzi, Gianluigi [146] | 1-6,1-6 | |
| Challenger - Buenos Aires | 11/14 16:00 | 26 | [273] Dimitar Kuzmanov v Quinzi, Gianluigi [150] | 6-2,6-3 | |
| Challenger - Buenos Aires | 11/13 16:00 | 25 | [244] Bellucci, Thomaz v Quinzi, Gianluigi [150] | 4-6,6-4,3-6 | |
| Challenger - Barcelone | 10/09 12:35 | 25 | [153] Quinzi, Gianluigi v Pedro Martinez [174] | 4-6,5-7 | |
| Florence, Italy | 10/04 10:10 | 26 | [154] Quinzi, Gianluigi v Andrea Pellegrino [413] | 6-7,1-6 | |
| Florence, Italy | 10/03 09:55 | 25 | [154] Quinzi, Gianluigi v Martin, Andrej [166] | 6-2,6-2 | |
| Challenger Sibiu | 09/18 10:50 | 25 | [344] Javier Barranco Cosano v Quinzi, Gianluigi [158] | Retired | |
| Challenger Szczecin | 09/14 15:30 | 27 | [400] Davidovich Fokina, Alejandro v Quinzi, Gianluigi [165] | 7-6,0-6,6-4 | |
| Challenger Szczecin | 09/12 11:00 | 26 | [165] Quinzi, Gianluigi v Barrios Vera, Marcelo Tomas [334] | 6-1,6-3 | |
| Challenger Szczecin | 09/10 15:40 | 25 | [350] Drzewiecki, Karol v Quinzi, Gianluigi [165] | 3-6,4-6 | |
| Genoa, Italy | 09/05 12:10 | 25 | [164] Quinzi, Gianluigi v Galovic, Viktor [223] | 6-4,4-6,3-6 | |
| US Open, New York, USA | 08/21 18:50 | 44 | [163] Quinzi, Gianluigi v Pedro Martinez [182] | 3-6,4-6 | |
| Portoroz, Slovénie | 08/07 14:25 | 25 | [164] Quinzi, Gianluigi v Gian Marco Moroni [231] | 3-6,7-6,5-7 | |
| Challenger Padova | 07/24 15:15 | 25 | [248] Pavic, Ante v Quinzi, Gianluigi [161] | 7-6,6-4 | |
| Challenger San Benedetto | 07/19 19:15 | 26 | [167] Quinzi, Gianluigi v Guttierrez-Ferrol, Sergio [233] | 6-1,4-6,1-6 | |
| Challenger San Benedetto | 07/17 19:00 | 25 | [167] Quinzi, Gianluigi v Andrea Vavassori [130] | 6-0,6-0 | |
| Challenger Perugia | 07/15 19:30 | 29 | Quinzi, Gianluigi v Ulises Blanch | 5-7,2-6 | |
| Challenger Perugia | 07/14 17:10 | 28 | [191] Salvatore Caruso v Quinzi, Gianluigi [200] | 2-6,0-6 |