| Challenger Tallahassee | 04/15 21:30 | 25 | 포니오, 기오바니 v Joel Schwaerzler | 2-6,4-6 | |
| Challenger Sarasota | 04/09 20:30 | 25 | [195] 리츠찰드, 알렉산더 v 포니오, 기오바니 [304] | 6-3,6-1 | |
| Challenger Sarasota | 04/08 16:50 | 19 | [304] 포니오, 기오바니 v 에드문드, 킬 [423] | 6-2,6-3 | |
| Challenger Sarasota | 04/07 20:10 | 14 | 포니오, 기오바니 v Vale, Duarte | 6-3,6-4 | |
| Challenger Mexico City | 04/02 19:30 | 25 | [302] 포니오, 기오바니 v 메지아, 니콜라스 [344] | 3-6,2-6 | |
| ITF M25 Badalona | 03/20 09:00 | 25 | [283] 포니오, 기오바니 v 로페즈 모릴로, 이마놀 [481] | 4-6,5-7 | |
| Challenger Szekesfehervar | 03/11 12:20 | 25 | [270] 포니오, 기오바니 v 피로스, 즈솜보르 [106] | 3-6,2-6 | |
| Challenger Tenerife Qual | 02/25 11:55 | 14 | [430] Carlos Lopez Montagud v 포니오, 기오바니 [277] | 6-4,6-2 | |
| Tenerife, Spain | 02/20 12:45 | 25 | [265] 안드리브, 아드리안 v 포니오, 기오바니 [277] | 4-6,6-3,7-5 | |
| Tenerife, Spain | 02/19 10:00 | 19 | [277] 포니오, 기오바니 v 바란코 코사노, 자비엘 [302] | 6-4,3-6,6-4 | |
| Tenerife, Spain | 02/18 10:00 | 14 | [277] 포니오, 기오바니 v 기우스티노, 로렌조 [330] | 4-6,6-4,6-1 | |
| Challenger Bengaluru | 02/12 10:30 | 25 | [277] 포니오, 기오바니 v 온클린, 가우시어 [252] | 4-6,6-1,6-7 |
Giovanni Fonio (born 7 May 1998) is an Italian tennis player. He took his first steps in tennis at the age of 5, at the Piazzano tennis club in Novara.
Fonio has a career high ATP singles ranking of 274 achieved on 4 Dicember 2023. He also has a career high doubles ranking of 406 achieved on 15 January 2024.
Fonio has won 2 ATP Challenger doubles title: at the 2023 Internazionali di Tennis del Friuli Venezia Giulia with Francesco Forti and at the 2021 Antalya Challenger III with Riccardo Bonadio.
The greatest victory achieved by Giovanni was certainly during the Yokkaichi Challenger in Japan, on 30 November 2023, when he beat the then top 100 player Yosuke Watanuki in 3 sets (3-6 / 6-2 / 7-5).
An important presence in high-level tournaments was certainly in May 2022 at the qualifiers at the Internazionali d’Italia, unfortunately he lost against Emil Ruusuvuori 2-1 (4-6 / 7-6 / 3-6).