| ITF M25 Hamburg | 10/20 14:35 | 25 | [265] Barrientos, Nicolas v Viktor Durasovic [343] | 3-6,6-4,2-6 | |
| ITF M25 Hamburg | 10/19 09:00 | 54 | Lucas Poullain v Barrientos, Nicolas | 7-5,6-7,8-10 | |
| ITF M25 Hamburg | 10/18 09:00 | 54 | Boerma, Pelle v Barrientos, Nicolas | 2-6,5-7 | |
| ITF M25 Plaisir | 09/16 12:00 | 25 | [475] Mertens, Yannick v Barrientos, Nicolas [262] | 1-6,6-2,6-3 | |
| ITF M25 Plaisir | 09/14 13:00 | 44 | Barrientos, Nicolas v Louis Dussin | 1-6,1-6 | |
| ITF M25 Plaisir | 09/14 08:00 | 44 | Barrientos, Nicolas v Bron, Hugo | 6-4,6-4 | |
| ITF M25 Plaisir | 09/13 12:05 | 44 | Barrientos, Nicolas v Antoine Ghibaudo | 6-1,6-1 | |
| Las Vegas, Singles M-ITF-USA-07A | 03/05 19:25 | 26 | [268] Barrientos, Nicolas v Alex Rybakov [481] | 1-6,6-4,4-6 | |
| Las Vegas, Singles M-ITF-USA-07A | 03/04 20:50 | 25 | Barrientos, Nicolas v Braswell, Micah | 6-0,6-1 | |
| Challenger - Morelos | 02/17 16:00 | 166 | [226] Roelofse, Ruan v Barrientos, Nicolas [273] | 6-3,2-6,6-3 | |
| ITF - M25 Naples | 02/11 15:00 | 44 | [241] Gomez, Alejandro v Barrientos, Nicolas [278] | 6-1,2-6,10-7 | |
| ITF - M25 Naples | 02/10 15:30 | 44 | A.J Catanzariti v Barrientos, Nicolas | 2-6,2-6 | |
| ITF - M25 Naples | 02/09 15:00 | 44 | Murillo, Sebastian v Barrientos, Nicolas | 0-6,3-6 | |
| ITF M25 Weston | 01/30 15:00 | 26 | Barrientos, Nicolas v Wilson Leite | 5-7,0-6 | |
| ITF M25 Weston | 01/29 16:40 | 25 | Alex Rybakov v Barrientos, Nicolas | 6-7,6-3,4-6 | |
| Ann Arbor, USA | 01/07 00:40 | 24 | [380] Velotti, Agustin v Barrientos, Nicolas [335] | 6-4,6-3 | |
| Santa Marta, Singles M-ITF-COL-02A | 12/08 20:55 | 29 | [280] Gomez, Alejandro v Barrientos, Nicolas [357] | 4-6,6-1,6-4 | |
| Santa Marta, Singles M-ITF-COL-02A | 12/07 20:00 | 28 | Juan Sebastian Gomez v Barrientos, Nicolas | 4-6,1-6 | |
| Santa Marta, Singles M-ITF-COL-02A | 12/06 20:00 | 27 | Mendoza, Alejandro v Barrientos, Nicolas | 4-6,2-6 | |
| Santa Marta, Singles M-ITF-COL-02A | 12/05 19:30 | 26 | [356] Barrientos, Nicolas v Filip C Jianu [426] | Retired | |
| Santa Marta, Singles M-ITF-COL-02A | 12/03 22:55 | 25 | Aguilar, Federico Juan v Barrientos, Nicolas | 1-6,3-6 | |
| Shenzhen II, Chine | 10/28 03:45 | 24 | [234] Tung-Lin Wu v Barrientos, Nicolas [354] | 6-3,7-5 | |
| Liuzhou, Chine | 10/22 06:15 | 25 | [90] Gunneswaran, Prajnesh v Barrientos, Nicolas [348] | 6-2,6-1 | |
| Liuzhou, Chine | 10/21 04:40 | 24 | [348] Barrientos, Nicolas v Fajing Sun [388] | 6-4,3-6,7-6 | |
| Ningbo, China | 10/16 02:00 | 25 | [188] Lopez Perez v Barrientos, Nicolas [343] | 6-4,6-3 | |
| Ningbo, China | 10/15 02:00 | 24 | [263] Goncalo Oliveira v Barrientos, Nicolas [343] | 5-7,0-6 | |
| Ningbo, China | 10/14 02:00 | 166 | Barrientos, Nicolas v Aoran Wang | Cancelled | |
| Portoroz, Slovénie | 08/13 08:00 | 24 | [412] Barrientos, Nicolas v Viktor Durasovic [429] | 2-6,6-3,1-6 | |
| Portoroz, Slovénie | 08/12 08:00 | 166 | [437] Erler, Alexander v Barrientos, Nicolas [412] | 6-3,2-6,2-6 | |
| Challenger Manerbio | 08/06 08:00 | 24 | Barrientos, Nicolas v Reboul, Fabien | 4-6,3-6 |