| Australian Open | 01/07 23:00 | 44 | [162] Alessandro Giannessi v Luca Vanni [164] | 4-6,4-6 | |
| Challenger Barcelona | 10/12 14:00 | 27 | Roberto Carballes Baena v Alessandro Giannessi | 6-2,6-2 | |
| Challenger Barcelona | 10/11 09:30 | 26 | [175] Alessandro Giannessi v Kenny de Schepper [191] | 6-3,6-2 | |
| Challenger Barcelona | 10/09 11:00 | 25 | Miguel Semmler v Alessandro Giannessi | 4-6,3-6 | |
| Challenger Florence | 10/02 11:00 | 25 | [216] Filip Horansky v Alessandro Giannessi [174] | 6-2,6-0 | |
| Challenger Banja Luka | 09/16 11:00 | 29 | [247] Alessandro Giannessi v Carlos Berlocq [161] | 6-7,6-4,6-4 | |
| Challenger Banja Luka | 09/15 10:30 | 28 | [275] Filippo Baldi v Alessandro Giannessi [247] | 6-7,4-6 | |
| Challenger Banja Luka | 09/14 10:30 | 27 | [259] Laurynas Grigelis v Alessandro Giannessi [247] | 3-6,4-6 | |
| Challenger Banja Luka | 09/13 08:30 | 26 | [282] Dimitar Kuzmanov v Alessandro Giannessi [247] | 6-2,2-6,2-6 | |
| Challenger Banja Luka | 09/11 11:05 | 25 | [247] Alessandro Giannessi v Andrej Martin [169] | 6-4,4-6,6-4 | |
| Challenger Sewilla | 09/03 18:30 | 25 | [374] Alejandro D-Fokina v Alessandro Giannessi [228] | 6-7,6-4,7-6 | |
| Challenger Como | 08/27 15:30 | 25 | [71] Martin Klizan v Alessandro Giannessi [228] | 6-2,6-4 | |
| US Open | 08/21 19:05 | 44 | [229] Alessandro Giannessi v Constant Lestienne [172] | 3-6,2-6 | |
| Challenger Scheveningen | 07/20 17:35 | 27 | [180] Alessandro Giannessi v Thiemo De Bakker [290] | 6-3,6-7,4-6 | |
| Challenger Scheveningen | 07/18 10:30 | 26 | [229] Dustin Brown v Alessandro Giannessi [180] | 6-4,2-6,3-6 | |
| Challenger Scheveningen | 07/16 11:30 | 25 | [180] Alessandro Giannessi v Tsung-Hua Yang [209] | 3-6,6-1,6-3 | |
| Challenger Perugia | 07/13 19:00 | 27 | [199] Alessandro Giannessi v Salvatore Caruso [191] | 6-4,4-6,4-6 | |
| Challenger Perugia | 07/12 11:00 | 26 | [257] Tomislav Brkic v Alessandro Giannessi [199] | 1-6,2-6 | |
| Challenger Perugia | 07/10 16:55 | 25 | [265] Facundo Arguello v Alessandro Giannessi [199] | 6-3,4-6,2-6 | |
| Wimbledon Qual | 06/28 10:00 | 45 | [201] Alessandro Giannessi v Stefano Travaglia [138] | 4-6,2-6,4-6 | |
| Wimbledon Qual | 06/26 15:50 | 45 | [107] Jurgen Zopp v Alessandro Giannessi [201] | 3-6,7-6,11-13 | |
| Wimbledon Qual | 06/25 10:00 | 44 | [204] Alessandro Giannessi v Danilo Petrovic [227] | 6-3,6-3 | |
| Challenger Caltanissetta | 06/15 17:20 | 27 | [217] Matteo Donati v Alessandro Giannessi [161] | Retired | |
| Challenger Caltanissetta | 06/14 16:30 | 26 | [145] Ernests Gulbis v Alessandro Giannessi [161] | 6-2,6-7,1-6 | |
| Challenger Caltanissetta | 06/12 14:30 | 25 | [161] Alessandro Giannessi v Maxime Janvier [333] | 6-1,6-4 | |
| Challenger Caltanissetta | 06/12 08:00 | - | Alessandro Giannessi v Taro Daniel | Cancelled | |
| Challenger Poznań | 06/09 12:00 | 28 | [199] Alessandro Giannessi v Hubert Hurkacz [188] | 4-6,6-3,3-6 | |
| Challenger Poznań | 06/08 11:00 | 27 | [211] Attila Balazs v Alessandro Giannessi [199] | 4-6,5-7 | |
| Challenger Poznań | 06/07 09:00 | 26 | Victor Estrella Burgos v Alessandro Giannessi | 6-4,3-6,3-6 | |
| Challenger Poznań | 06/05 10:40 | 25 | [199] Alessandro Giannessi v Pedro Sousa [120] | 6-2,6-3 |
Alessandro Giannessi (ur. 30 maja 1990 w La Spezii) – włoski tenisista, reprezentant w Pucharze Davsa.