| Challenger Francavilla | 05/07 10:50 | 14 | Barrientos, Nicolas v Enrico Dalla Valle | 6-1,0-6,5-7 | |
| Challenger - Cagliari | 05/02 08:00 | 19 | [261] Steven Diez v Barrientos, Nicolas [66] | 6-0,4-6,6-3 | |
| Challenger - Cagliari | 05/01 13:30 | 14 | [66] Barrientos, Nicolas v Lucas Miedler [38] | 6-2,6-1 | |
| Challenger - Rome | 04/23 14:00 | 14 | [62] Barrientos, Nicolas v Forti, Francesco [361] | 3-6,1-6 | |
| Puerto Vallarta, Mexico | 03/05 22:05 | 14 | [61] Barrientos, Nicolas v Illya Marchenko [388] | 1-6,3-6 | |
| Coupe Davis | 02/04 21:50 | 45 | Barrientos, Nicolas v Daniel Evans | Cancelled | |
| Coupe Davis | 02/03 23:00 | 45 | [67] Barrientos, Nicolas v Cameron Norrie [11] | 2-6,5-7 | |
| Challenger - Gwangju | 10/04 06:15 | 25 | [360] Barrientos, Nicolas v Jason Jung [453] | 1-6,6-4,6-7 | |
| Coupe Davis | 09/18 17:40 | 4 | [349] Barrientos, Nicolas v Yanki Erel [440] | 6-4,7-5 | |
| Santo Domingo, Dominican Republic | 08/16 18:00 | 25 | [316] Alvarez, Nicolas v Barrientos, Nicolas [350] | 7-5,4-6,6-3 | |
| Santo Domingo, Dominican Republic | 08/16 18:00 | 25 | Gastao Elias v Barrientos, Nicolas | Cancelled | |
| Santo Domingo, Dominican Republic | 08/15 18:00 | 19 | [350] Barrientos, Nicolas v Huertas Del Pino Cordova, Arklon [485] | 6-2,6-4 | |
| Santo Domingo, Dominican Republic | 08/14 16:35 | 14 | Barrientos, Nicolas v Alejandro Jose Gandini | 6-3,6-1 | |
| ATP - Los Cabos | 08/03 00:00 | 25 | Alex Hernandez v Barrientos, Nicolas | 3-6,6-4,6-4 | |
| ATP - Los Cabos | 08/01 03:25 | 19 | [177] Kaichi Uchida v Barrientos, Nicolas [350] | 6-1,4-6,6-4 | |
| ATP - Los Cabos | 07/31 03:10 | 14 | [378] Pervolarakis, Michail v Barrientos, Nicolas [350] | 3-6,4-6 | |
| Umag, Croatia | 07/23 14:00 | 26 | [131] Elias Ymer v Barrientos, Nicolas [347] | 6-4,6-7,7-5 | |
| Challenger Amersfoort | 07/10 12:45 | 45 | [385] Cervantes, Inigo v Barrientos, Nicolas [353] | 6-4,6-1 | |
| Parma II, Italy | 06/13 11:05 | 19 | [276] Oriol Roca Batalla v Barrientos, Nicolas [347] | 3-6,6-3,6-1 | |
| Parma II, Italy | 06/12 12:30 | 14 | Gabriele Piraino v Barrientos, Nicolas | 7-6,3-6,6-7 | |
| Challenger Perugia | 06/06 11:00 | 19 | Barrientos, Nicolas v Giorgio Tabacco | 4-6,6-3,1-6 | |
| Challenger Perugia | 06/05 12:00 | 14 | Barrientos, Nicolas v Gabriele Piraino | 7-5,6-3 | |
| Challenger Vicenza | 05/24 10:55 | 25 | [359] Barrientos, Nicolas v Daniel Dutra Da Silva [273] | 0-6,4-6 | |
| Challenger Vicenza | 05/23 08:00 | 19 | Barrientos, Nicolas v Balzerani, Riccardo | 6-4,6-0 | |
| Challenger Aguascalientes | 04/20 16:00 | 26 | [374] Barrientos, Nicolas v Filip C Jianu [305] | 5-7,2-6 | |
| Challenger Aguascalientes | 04/19 17:30 | 25 | [374] Barrientos, Nicolas v Jaziri, Malek [315] | 6-3,6-4 | |
| Challenger Aguascalientes | 04/19 17:20 | 25 | Barrientos, Nicolas v Nicola Kuhn | Cancelled | |
| Challenger Aguascalientes | 04/18 17:55 | 19 | [315] Jaziri, Malek v Barrientos, Nicolas [374] | 4-6,2-6 | |
| Challenger Aguascalientes | 04/17 21:35 | 14 | Alex Hernandez v Barrientos, Nicolas | 3-6,4-6 | |
| Challenger - Mexique | 04/06 18:10 | 26 | [413] Barrientos, Nicolas v Gerald Melzer [271] | 1-6,1-6 |