| Austraalia lahtised meistrivõistlused | 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 - Sevilla | 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 | |
| USA lahtised meistrivõistlused | 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 - Poznan | 06/09 12:00 | 28 | [199] Alessandro Giannessi v Hubert Hurkacz [188] | 4-6,6-3,3-6 | |
| Challenger - Poznan | 06/08 11:00 | 27 | [211] Attila Balazs v Alessandro Giannessi [199] | 4-6,5-7 | |
| Challenger - Poznan | 06/07 09:00 | 26 | Victor Estrella Burgos v Alessandro Giannessi | 6-4,3-6,3-6 | |
| Challenger - Poznan | 06/05 10:40 | 25 | [199] Alessandro Giannessi v Pedro Sousa [120] | 6-2,6-3 |
Alessandro Giannessi (born 30 May 1990) is a professional Italian tennis player. On 24 July 2017 he reached his highest ATP singles ranking of world No. 84 while his best doubles ranking was No. 171 on 14 October 2013.
Giannessi made his Grand Slam debut at the 2016 US Open as a qualifier where he recorded his first Major win defeating Denis Kudla in five sets.
Giannessi was a singles semifinalist at the 2017 Croatia Open Umag.
At the 2021 French Open he made his debut at this Major after qualifying for the main draw with a win over Francisco Cerundolo.
At the 2022 French Open although he lost in the third round of qualifying to Sebastian Ofner he entered the main draw as a lucky loser.
He won his fourth Challenger title and first since 2019 at the 2023 Zadar Open this time with a win over Sebastian Ofner.