| Challenger Surbiton | 06/06 15:15 | 25 |
[140] Liam Broady
v
Gabriel Diallo [146] 
|
4-6,4-6 | |
| French Open | 05/23 16:45 | 14 |
[147] Timofey Skatov
v
Gabriel Diallo [146]
|
6-4,7-6 | |
| Challenger Busan | 05/13 06:00 | 28 |
[87] Max Purcell
v
Gabriel Diallo [162]
|
6-4,7-5 | |
| Challenger Busan | 05/12 06:35 | 27 |
[80] Jordan Thompson
v
Gabriel Diallo [162]
|
3-6,5-7 | |
| Challenger Busan | 05/11 06:40 | 26 |
[328] Yunseong Chung
v
Gabriel Diallo [162]
|
6-7,6-7 | |
| Challenger Busan | 05/09 02:00 | 25 |
[167] Jisung Nam
v
Gabriel Diallo [162]
|
3-6,3-6 | |
| Challenger Gwangju | 05/01 08:05 | 25 |
[141] Rinky Hijikata
v
Gabriel Diallo [169]
|
6-2,6-4 | |
| Challenger Seoul | 04/27 06:45 | 26 |
[169] Gabriel Diallo v
Christopher Eubanks
[90] 
|
6-2,3-6,2-6 | |
| Challenger Seoul | 04/24 06:45 | 25 |
[169] Gabriel Diallo v
Yu Hsiou Hsu
[188] 
|
6-2,6-3 | |
| Challenger Sarasota | 04/14 18:10 | 27 |
[113] Daniel Altmaier
v
Gabriel Diallo [178]
|
Retired | |
| Challenger Sarasota | 04/12 19:20 | 26 |
[178] Gabriel Diallo v
Mitchell Krueger
[262] 
|
6-2,6-4 | |
| Challenger Sarasota | 04/11 17:00 | 25 |
[158] Facundo D Acosta
v
Gabriel Diallo [178]
|
6-3,2-6,6-7 | |
| Challenger Lille | 03/31 16:35 | 27 |
[212] Gabriel Diallo v
Jurij Rodionov
[131] 
|
6-2,5-7,1-6 | |
| Challenger Lille | 03/30 17:00 | 26 |
[212] Gabriel Diallo v
Richard Berankis
[235] |
6-3,7-5 | |
| Challenger Lille | 03/29 11:15 | 25 |
[146] Hugo Grenier
v
Gabriel Diallo [212]
|
6-4,4-6,2-6 | |
| Challenger Biel | 03/24 15:50 | 27 |
[161] Liam Broady
v
Gabriel Diallo [212]
|
3-6,7-5,6-3 | |
| Challenger Biel | 03/23 13:55 | 26 |
Kirill Kivattsev
v
Gabriel Diallo
|
2-6,3-6 | |
| Challenger Biel | 03/22 13:55 | 25 |
Dylan Dietrich
v
Gabriel Diallo
|
6-4,1-6,4-6 | |
| ITF M25 Montreal | 03/19 15:00 | 29 |
[213] Gabriel Diallo v
Henri Squire
[325] 
|
7-6,6-3 | |
| ITF M25 Montreal | 03/18 15:00 | 28 |
[213] Gabriel Diallo v
Strong Kirchheimer
[437] |
6-2,7-6 | |
| ITF M25 Montreal | 03/18 14:00 | 26 |
Gabriel Diallo v
Roy Smith
|
Cancelled | |
| ITF M25 Montreal | 03/17 14:00 | 27 |
Gabriel Diallo v
Tibo Colson
|
6-2,7-5 | |
| ITF M25 Montreal | 03/16 15:25 | 26 |
Gabriel Diallo v
Aurel Ciocanu
|
6-3,6-3 | |
| ITF M25 Montreal | 03/14 18:10 | 25 |
Gabriel Diallo v
Toby Kodat
|
6-1,6-7,7-6 | |
| Challenger Puerto Vallarta | 03/08 01:30 | 25 |
[309] Yuta Shimizu
v
Gabriel Diallo [213]
|
4-6,6-3,7-6 | |
| ATP Dallas | 02/08 18:00 | 25 |
[102] Emilio Gomez
v
Gabriel Diallo [211]
|
6-4,6-7,7-6 | |
| ATP Dallas | 02/06 19:35 | 19 |
[195] Brandon Holt
v
Gabriel Diallo [211]
|
7-6,7-6 | |
| ATP Dallas | 02/05 23:05 | 14 |
Antonio M-Hidalgo
v
Gabriel Diallo
|
4-6,3-6 | |
| Challenger Cleveland | 02/03 19:35 | 27 |
[106] Emilio Gomez
v
Gabriel Diallo [221]
|
7-6,4-6,7-5 | |
| Challenger Cleveland | 02/01 17:50 | 26 |
[229] Mitchell Krueger
v
Gabriel Diallo [221]
|
7-6,1-6,1-6 |