| ATP Munich | 04/13 12:00 | 14 | [303] 지아네시, 알레산드로 v 후에슬러, 마르크-안드레아 [232] | 3-6,0-6 | |
| Challenger Sarasota | 04/09 15:00 | 25 | 지아네시, 알레산드로 v 헤메리, 칼빈 | 4-6,6-2,2-6 | |
| Challenger Mexico City | 04/03 19:25 | 26 | [304] 마요, 아이단 v 지아네시, 알레산드로 [297] | 3-6,7-6,6-3 | |
| Challenger Mexico City | 04/01 21:45 | 25 | 지아네시, 알레산드로 v 포스피실, 바세크 | 6-3,3-6,6-4 | |
| Challenger Naples | 03/25 09:00 | 19 | 지아네시, 알레산드로 v 푸르네스, 에반 | Retired | |
| Challenger Naples | 03/24 10:45 | 14 | 지아네시, 알레산드로 v Fabrizio K P Osti | 6-3,6-1 | |
| Zadar, Croatia | 03/20 11:05 | 26 | [273] 스카토브, 티모페이 v 지아네시, 알레산드로 [241] | 6-1,6-2 | |
| Zadar, Croatia | 03/18 12:30 | 25 | [241] 지아네시, 알레산드로 v 모우테트, 고렌틴 [107] | 5-7,6-2,6-4 | |
| Challenger Szekesfehervar | 03/13 11:25 | 26 | [234] 지아네시, 알레산드로 v 마르티네아우, 마테오 [190] | 4-6,6-7 | |
| Challenger Szekesfehervar | 03/11 12:25 | 25 | [234] 지아네시, 알레산드로 v 보우르게, 마티아스 [272] | 6-4,1-6,6-4 | |
| Tenerife, Spain | 02/27 12:15 | 25 | [430] Carlos Lopez Montagud v 지아네시, 알레산드로 [232] | Retired | |
| Tenerife, Spain | 02/20 10:00 | 25 | [183] 기간트, 마테오 v 지아네시, 알레산드로 [234] | 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.