Challenger Olbia | 10/17 20:10 | 25 | [141] Lloyd Harris v Alessandro Giannessi [210] | 7-6,6-0 | |
Challenger Lisabon | 10/02 14:10 | 25 | [139] Pablo Llamas Ruiz v Alessandro Giannessi [213] | 6-3,6-1 | |
Challenger Braga | 09/27 12:55 | 26 | [199] Duje Ajdukovic v Alessandro Giannessi [213] | 7-5,5-7,6-2 | |
Challenger Braga | 09/26 14:00 | 25 | [351] Gastao Elias v Alessandro Giannessi [215] | 6-7,4-6 | |
Challenger Sibiu | 09/19 10:20 | 25 | Bor Artnak v Alessandro Giannessi | Retired | |
Challenger Sevilla | 09/07 19:00 | 27 | [244] Alessandro Giannessi v Hugo Gaston [99] | 6-3,1-6,0-6 | |
Challenger Sevilla | 09/06 09:00 | 26 | [244] Alessandro Giannessi v Daniel Rincon [228] | 7-6,6-0 | |
Challenger Sevilla | 09/04 19:50 | 25 | [82] Jaume Munar v Alessandro Giannessi [244] | 7-6,3-6,4-6 | |
Challenger Como | 08/31 10:30 | 26 | [244] Alessandro Giannessi v Rudolf Molleker [232] | 3-6,1-6 | |
Challenger Como | 08/29 09:00 | 25 | [199] Jelle Sels v Alessandro Giannessi [244] | 2-6,2-6 | |
US Open | 08/24 14:00 | 15 | [245] Alessandro Giannessi v Giulio Zeppieri [137] | 3-6,4-6 | |
US Open | 08/22 17:45 | 14 | [245] Alessandro Giannessi v Harold Mayot [211] | 7-6,7-5 | |
Challenger San Marino | 08/02 11:00 | 26 | [234] Federico Delbonis v Alessandro Giannessi [235] | 6-3,5-7,6-1 | |
Challenger San Marino | 07/31 17:00 | 25 | [235] Alessandro Giannessi v Moez Echargui [291] | 1-6,6-4,6-4 | |
Challenger Trieste | 07/18 13:50 | 25 | [348] Stefano Napolitano v Alessandro Giannessi [235] | 6-4,6-2 | |
Challenger Trieste | 07/18 08:00 | 25 | Franco Agamenone v Alessandro Giannessi | Cancelled | |
Challenger San Benedetto | 07/11 14:50 | 25 | Alessandro Giannessi v Luciano Darderi | Cancelled | |
Challenger Milán | 07/05 08:30 | 26 | [216] Gauthier Onclin v Alessandro Giannessi [241] | 6-4,6-1 | |
Challenger Milán | 07/03 13:00 | 25 | [241] Alessandro Giannessi v Francesco Maestrelli [149] | 6-3,3-6,6-1 | |
Wimbledon | 06/26 13:05 | 14 | [235] Alessandro Giannessi v Charles Broom [374] | 4-6,7-6,3-6 | |
Challenger Parma | 06/22 11:00 | 27 | [254] Alessandro Giannessi v Alexandre Muller [103] | 6-3,3-6,1-6 | |
Challenger Parma | 06/21 10:30 | 26 | [254] Alessandro Giannessi v Oriol Roca Batalla [306] | 6-4,6-2 | |
Challenger Parma | 06/20 13:30 | 25 | [304] Maxime Janvier v Alessandro Giannessi [254] | 4-6,6-4,1-6 | |
Challenger Parma | 06/20 13:30 | 25 | Fabian Marozsan v Alessandro Giannessi | Cancelled | |
Challenger Perugia | 06/12 16:00 | 25 | [251] Matteo Gigante v Alessandro Giannessi [238] | Retired | |
ATP Ženeva | 05/21 11:20 | 19 | [230] Alessandro Giannessi v Vitaliy Sachko [282] | 5-7,2-6 | |
ATP Ženeva | 05/20 11:30 | 14 | [230] Alessandro Giannessi v Denis Yevseyev [296] | 3-6,6-4,6-2 | |
Challenger Oeiras | 05/16 10:10 | 25 | [179] Jan Choinski v Alessandro Giannessi [230] | 6-3,4-6,6-4 | |
Challenger Oeiras | 05/15 09:00 | 19 | [230] Alessandro Giannessi v Daniel Michalski [289] | 6-4,6-4 | |
Challenger Oeiras | 05/14 10:25 | 14 | [230] Alessandro Giannessi v Alberto Barroso Campos [452] | 6-1,6-3 |
Alessandro Giannessi (* 30. května 1990 La Spezia) je italský profesionální tenista hrající levou rukou. Ve své dosavadní kariéře na okruhu ATP World Tour nevyhrál žádný turnaj. Na challengerech ATP a okruhu ITF získal do září 2016 šest titulů ve dvouhře a sedm ve čtyřhře.
Na žebříčku ATP byl ve dvouhře nejvýše klasifikován v dubnu 2012 na 126. místě a ve čtyřhře pak v říjnu 2013 na 171. místě. Trénují ho Gabrio Castrichella a Eduardo Infantino.
V italském daviscupovém týmu neodehrál žádné utkání.