| Challenger - Monterrey | 03/07 23:10 | 25 | [380] Ulises Blanch v Julian Lenz [289] | 6-3,4-6,6-2 | |
| Challenger - Turim | 03/01 11:20 | 25 | [291] Julian Lenz v Antoine Escoffier [263] | 0-6,6-7 | |
| Challenger - Forlì | 02/21 10:50 | 19 | [250] Andrea Arnaboldi v Julian Lenz [286] | 7-6,3-6,6-4 | |
| Challenger - Forlì - Qualificação | 02/20 11:45 | 14 | [380] Shintaro Mochizuki v Julian Lenz [292] | 3-6,6-2,2-6 | |
| ATP - Marselha | 02/14 13:15 | 19 | [163] Roman Safiullin v Julian Lenz [292] | 6-4,6-3 | |
| ATP - Marselha | 02/13 13:50 | 14 | [292] Julian Lenz v Flavio Cobolli [193] | 7-5,6-2 | |
| Challenger - Forlì | 01/05 13:15 | 26 | [300] Julian Lenz v Cedrik-Marcel Stebe [227] | 2-6,6-7 | |
| Challenger - Forlì | 01/03 18:20 | 25 | [300] Julian Lenz v Yu Hsiou Hsu [362] | 6-4,6-4 | |
| Challenger - Forlì | 12/06 13:00 | 25 | [371] Gijs Brouwer v Julian Lenz [297] | 6-2,6-3 | |
| Challenger - Forlì | 12/03 15:30 | 27 | [310] Julian Lenz v Maxime Cressy [122] | 3-6,4-6 | |
| Challenger - Forlì | 12/01 16:35 | 26 | [310] Julian Lenz v Dominic Stephan Stricker [242] | 7-5,7-5 | |
| Challenger - Forlì | 11/30 13:10 | 25 | [153] Federico Gaio v Julian Lenz [310] | 0-6,3-6 | |
| Challenger - Bari | 11/25 13:20 | 26 | [317] Julian Lenz v Luca Nardi [460] | 3-6,2-6 | |
| Challenger - Bari | 11/23 09:00 | 25 | [317] Julian Lenz v Tim Van Rijthoven [254] | 7-5,5-7,6-4 | |
| Challenger - Helsínquia | 11/17 13:40 | 26 | [304] Julian Lenz v Henri Laaksonen [97] | 2-6,5-7 | |
| Challenger - Helsínquia | 11/16 12:45 | 25 | [261] Jack Draper v Julian Lenz [304] | 5-7,1-6 | |
| Challenger - Eckental | 11/02 12:25 | 25 | Henri Squire v Julian Lenz | Cancelled | |
| Challenger - Ismaning | 10/28 11:00 | 26 | [135] Oscar Otte v Julian Lenz [314] | 6-3,6-4 | |
| Challenger - Ismaning | 10/26 11:20 | 25 | [160] Cem Ilkel v Julian Lenz [314] | 7-6,5-7,1-6 | |
| Challenger - Ismaning | 10/25 11:25 | - | [342] Mischa Zverev v Julian Lenz [314] | 5-7,6-7 | |
| Challenger - Ismaning | 10/24 12:40 | 26 | [305] Julian Lenz v Geoffrey Blancaneaux [284] | 6-4,7-5 | |
| Challenger - Santiago | 10/11 14:00 | 25 | [103] Juan Manuel Cerundolo v Julian Lenz [290] | 6-3,6-3 | |
| Challenger - Santiago | 10/07 14:00 | 26 | [290] Julian Lenz v Juan Pablo Varillas [127] | 2-6,4-6 | |
| Challenger - Santiago | 10/05 16:25 | 25 | Victor Nunez v Julian Lenz | 0-6,2-6 | |
| Challenger - Lima | 09/30 15:00 | 26 | [245] Camilo Ugo Carabelli v Julian Lenz [293] | 7-5,6-3 | |
| Challenger - Lima | 09/28 15:00 | 25 | [293] Julian Lenz v Conner Huertas Del Pino [395] | 6-3,6-3 | |
| Challenger - Ambato | 09/23 15:00 | 26 | Gerald Melzer v Julian Lenz | 6-3,7-5 | |
| Challenger - Ambato | 09/21 20:15 | 25 | [294] Julian Lenz v Emilio Gomez [161] | 6-4,7-6 | |
| Challenge - Sevilha | 09/08 09:00 | 26 | [298] Julian Lenz v Carlos Taberner [105] | 3-6,3-6 | |
| Challenge - Sevilha | 09/06 17:00 | 25 | [303] Goncalo Oliveira v Julian Lenz [298] | 2-6,6-4,2-6 |