| ITF M15 Lodz | 08/21 08:00 | 28 | Gilbert Klier Junior v Maciej Rajski | 4-6,6-7 | |
| ITF M15 Lodz | 08/20 10:15 | 27 | [423] Daniel Michalski v Gilbert Klier Junior [468] | 6-4,3-6,3-6 | |
| ITF M15 Lodz | 08/19 10:00 | 26 | Tommaso Compagnucci v Gilbert Klier Junior | 4-6,2-6 | |
| ITF M15 Lodz | 08/18 11:25 | 25 | Aristotelis Thanos v Gilbert Klier Junior | 2-6,3-6 | |
| ITF M15 Gdynia | 08/12 09:25 | 26 | Gilbert Klier Junior v Daniel De Jonge | 5-7,1-6 | |
| ITF M15 Gdynia | 08/11 09:40 | 25 | Antonin Bolardt v Gilbert Klier Junior | 6-2,1-6,2-6 | |
| ITF M25 Grodzisk Mazowiecki | 08/07 07:00 | 26 | Gilbert Klier Junior v Toby Kodat | 6-1,6-7,3-6 | |
| ITF M25 Grodzisk Mazowiecki | 08/05 08:30 | 25 | Filip Peliwo v Gilbert Klier Junior | 3-6,5-7 | |
| ITF M15 Castelo Branco | 08/01 09:00 | 29 | Clement Chidekh v Gilbert Klier Junior | 2-6,1-6 | |
| ITF M15 Castelo Branco | 07/31 08:30 | 28 | Joao Lucas Reis da Silva v Gilbert Klier Junior | 6-4,2-6,6-7 | |
| ITF M15 Castelo Branco | 07/30 10:00 | 27 | Gilbert Klier Junior v Sho Shimabukuro | 7-6,6-3 | |
| ITF M15 Castelo Branco | 07/29 08:30 | 26 | Garrett Johns v Gilbert Klier Junior | 5-7,3-6 | |
| ITF M15 Castelo Branco | 07/27 08:30 | 25 | Vilius Gaubas v Gilbert Klier Junior | 4-6,3-6 | |
| ITF M25 Idanha-A-Nova | 07/24 08:30 | 28 | Gilbert Klier Junior v Simon Carr | 2-6,6-7 | |
| ITF M25 Idanha-A-Nova | 07/23 09:00 | 27 | Anton Matusevich v Gilbert Klier Junior | 3-6,3-6 | |
| ITF M25 Idanha-A-Nova | 07/22 08:00 | 26 | Gilbert Klier Junior v Roy Smith | 6-3,6-2 | |
| ITF M25 Idanha-A-Nova | 07/21 09:50 | 25 | Garrett Johns v Gilbert Klier Junior | 5-7,1-6 | |
| ITF M15 Sarajevo | 06/03 09:00 | 26 | Gilbert Klier Junior v Matheus P De Almeida | 6-4,3-6,3-6 | |
| ITF M15 Sarajevo | 06/02 09:00 | 25 | Gilbert Klier Junior v Kristjan Tamm | 6-4,6-2 | |
| ITF M25 Kiseljak | 05/26 15:30 | 25 | Gilbert Klier Junior v David Pichler | 4-6,3-6 | |
| ITF M15 Brcko | 05/21 09:00 | 25 | Gilbert Klier Junior v Eric Vanshelboim | 6-2,4-6,0-6 | |
| ITF M15 Prijedor | 05/11 12:35 | 25 | Luca Giacomini v Gilbert Klier Junior | 6-3,1-6,6-1 | |
| ITF M15 Monastir | 04/30 08:25 | 27 | Yunseong Chung v Gilbert Klier Junior | 6-2,3-6,6-1 | |
| ITF M15 Monastir | 04/29 08:30 | 26 | Gilbert Klier Junior v Zachary Svajda | 2-6,6-4,6-3 | |
| ITF M15 Monastir | 04/27 08:30 | 25 | Gilbert Klier Junior v Filip Bergevi | 6-1,6-2 | |
| ITF M15 Monastir | 04/21 08:30 | 25 | Gilbert Klier Junior v Alexander Donski | 4-6,6-4,3-6 | |
| ITF M15 Monastir | 04/16 08:30 | 27 | Eliakim Coulibaly v Gilbert Klier Junior | 7-5,6-4 | |
| ITF M15 Monastir | 04/15 08:25 | 26 | Gilbert Klier Junior v Laurynas Grigelis | 6-3,6-3 | |
| ITF M15 Monastir | 04/13 12:25 | 25 | Gilbert Klier Junior v Kamran Hanif | 6-0,6-2 | |
| ITF M15 Monastir | 04/07 12:45 | 25 | Gilbert Klier Junior v Buvaysar Gadamauri | Retired |