| ITF M25 Santa Margherita | 10/12 08:00 | 27 | [459] Marcello Serafini v Giovanni Fonio [311] | 7-6,6-3 | |
| ITF M25 Santa Margherita | 10/11 09:20 | 26 | Niccolo Catini v Giovanni Fonio | 2-6,3-6 | |
| ITF M25 Santa Margherita | 10/10 09:45 | 25 | Gabriele Piraino v Giovanni Fonio | 6-7,0-6 | |
| Challenger Lisbon | 10/01 10:45 | 14 |
[314] Giovanni Fonio v
Luka Mikrut
[411]
|
6-7,3-6 | |
| Challenger Braga | 09/25 11:40 | 19 |
[270] Oriol Roca Batalla
v
Giovanni Fonio [305] |
6-3,6-7,6-1 | |
| Challenger Braga | 09/24 14:10 | 14 | Pedro Araujo v Giovanni Fonio | 1-6,7-5,5-7 | |
| Challenger Sibiu | 09/21 08:40 | 26 |
[207] Duje Ajdukovic
v
Giovanni Fonio [305] |
4-6,6-3,6-2 | |
| Challenger Sibiu | 09/19 15:20 | 25 |
[305] Giovanni Fonio v
Cezar Cretu
[355]
|
7-6,6-3 | |
| Challenger Genoa | 09/04 11:50 | 25 | [289] Giovanni Fonio v Franco Agamenone [193] | 6-7,6-4,3-6 | |
| Challenger Como | 08/29 10:35 | 19 | [289] Giovanni Fonio v Valentin Royer [335] | 4-6,4-6 | |
| Challenger Como | 08/28 13:40 | 14 | [289] Giovanni Fonio v David Jorda Sanchis [373] | 4-6,6-3,7-5 | |
| Challenger Augsburg | 08/22 08:00 | 25 |
[294] Oliver Crawford
v
Giovanni Fonio [288] |
6-2,6-3 | |
| Challenger Todi | 08/18 19:00 | 28 |
[334] Clement Tabur
v
Giovanni Fonio [322] |
7-5,4-6,6-3 | |
| Challenger Todi | 08/17 20:10 | 27 | Felix Gill v Giovanni Fonio | 3-6,4-6 | |
| Challenger Todi | 08/16 19:45 | 26 | [322] Giovanni Fonio v Julian Ocleppo [448] | 6-3,6-7,6-4 | |
| Challenger Todi | 08/15 09:55 | 25 |
[322] Giovanni Fonio v
Orlando Luz
[461]
|
7-6,6-4 | |
| Challenger Cordenons | 08/08 08:00 | 25 | [323] Giovanni Fonio v Nicholas D Ionel [208] | 3-6,7-5,5-7 | |
| Challenger Liberec | 07/31 14:00 | 25 |
[316] Giovanni Fonio v
Norbert Gombos
[217]
|
6-7,4-6 | |
| Challenger Zug | 07/23 09:00 | 14 | Giovanni Fonio v Dylan Dietrich | 3-6,3-6 | |
| Challenger Tampere | 07/17 15:30 | 25 |
[289] Giovanni Fonio v
Vit Kopriva
[249]
|
4-6,6-7 | |
| Challenger Troyes | 07/07 14:15 | 27 | [291] Giovanni Fonio v David Jorda Sanchis [438] | Retired | |
| Challenger Troyes | 07/05 10:20 | 26 |
[291] Giovanni Fonio v
Moez Echargui
[279]
|
6-3,6-2 | |
| Challenger Troyes | 07/03 15:30 | 25 | [236] Sarah Dvorak v Giovanni Fonio [291] | 4-6,2-6 | |
| Challenger Modena | 06/27 12:50 | 25 | [227] Renzo Olivo v Giovanni Fonio [286] | 7-5,6-4 | |
| Challenger Parma | 06/21 16:00 | 26 |
[72] Albert Ramos-Vinolas
v
Giovanni Fonio [283] |
6-1,3-6,6-3 | |
| Challenger Parma | 06/20 08:30 | 25 | Giovanni Fonio v Filippo Moroni | 6-3,6-2 | |
| Challenger Bratislava | 06/12 13:15 | 19 | [285] Giovanni Fonio v Mohamed Safwat [474] | 6-3,3-6,2-6 | |
| Challenger Bratislava | 06/11 12:20 | 45 | [276] Giovanni Fonio v Wilson Leite [490] | 7-6,6-1 | |
| Challenger Vicenza | 05/29 08:30 | 19 |
[276] Giovanni Fonio v
Vitaliy Sachko
[275]
|
4-6,6-7 | |
| Challenger Vicenza | 05/28 08:30 | 14 | [276] Giovanni Fonio v Alexander Weis [320] | 6-2,6-4 |
Giovanni Fonio (born 7 May 1998) is an Italian tennis player.
Fonio has a career high ATP singles ranking of world No. 269 achieved on 29 January 2024. He also has a career high doubles ranking of No. 406 achieved on 15 January 2024.
Fonio has won 2 ATP Challenger doubles title: at the 2021 Antalya Challenger III with Riccardo Bonadio and at the 2023 Internazionali di Tennis del Friuli Venezia Giulia with Francesco Forti.
In May 2022, at the qualifiers at the Internazionali d’Italia he lost to Emil Ruusuvuori.
On 30 November 2023, at the Yokkaichi Challenger in Japan, he defeated the then top 100 player Yosuke Watanuki in 3 sets.