| Challenger Lima | 09/28 15:00 | 25 | [380] Johan Nikles v Adrian Menendez-Maceiras [301] | 6-4,6-2 | |
| Challenger Lima | 09/27 15:00 | 19 | [380] Johan Nikles v Oscar Jose Gutierrez [355] | 6-4,6-2 | |
| Challenger Lima | 09/26 21:20 | 14 | Johan Nikles v Gianluca Ballotta | 6-0,6-3 | |
| Challenger Ambato | 09/24 17:40 | 27 | [410] Johan Nikles v Juan Pablo Ficovich [236] | 6-0,6-7,5-7 | |
| Challenger Ambato | 09/22 18:40 | 26 | [325] Pedro Sakamoto v Johan Nikles [410] | 3-6,4-6 | |
| Challenger Ambato | 09/21 17:40 | 25 | [394] Pol M Tiffon v Johan Nikles [410] | 5-7,6-7 | |
| Challenger Quito | 09/14 15:00 | 25 | [409] Johan Nikles v Alexis Gautier [444] | 0-6,4-6 | |
| ITF - Oviedo M25 | 09/02 10:20 | 27 | [410] Johan Nikles v Alvaro Lopez San Martin [398] | 6-7,6-4,5-7 | |
| ITF - Oviedo M25 | 09/01 14:20 | 26 | Johan Nikles v Julio Cesar Porras | 7-5,6-4 | |
| ITF - Oviedo M25 | 08/31 10:00 | 25 | [410] Johan Nikles v Federico Zeballos [244] | 7-6,6-2 | |
| Challenger Warszawa | 08/25 10:30 | 25 | [409] Johan Nikles v Jozef Kovalik [121] | 3-6,4-6 | |
| Challenger Warszawa | 08/24 11:30 | 19 | Johan Nikles v Jonathan Mridha | 6-4,6-7,6-3 | |
| Challenger Warszawa | 08/22 13:35 | 14 | [412] Johan Nikles v Lucas Gerch [486] | 6-4,7-5 | |
| ATP Gstaad | 07/19 10:30 | 25 | [409] Johan Nikles v Vit Kopriva [249] | 2-6,1-6 | |
| Challenger Amersfoort | 07/15 18:05 | 26 | [435] Johan Nikles v Lukas Rosol [214] | 2-6,1-6 | |
| Challenger Amersfoort | 07/13 10:15 | 25 | [343] Ryan Nijboer v Johan Nikles [435] | 6-7,2-6 | |
| Challenger Amersfoort | 07/12 09:00 | 19 | [381] Jeremy Jahn v Johan Nikles [435] | 2-6,3-6 | |
| Challenger Amersfoort | 07/11 14:00 | 14 | Dominik Palan v Johan Nikles | 4-6,6-7 | |
| ITF - Haga M25 | 07/03 08:00 | 28 | [335] Javier Barranco Cosano v Johan Nikles [458] | 7-5,6-4 | |
| ITF - Haga M25 | 07/02 10:30 | 27 | [436] Mateus D C C Alves v Johan Nikles [458] | 2-6,6-7 | |
| ITF - Haga M25 | 07/01 10:50 | 26 | [458] Johan Nikles v Julian Ocleppo [355] | 6-4,6-1 | |
| ITF - Haga M25 | 06/30 13:50 | 25 | [458] Johan Nikles v Louis Wessels [470] | Retired | |
| ITF - Klosters M25 | 06/23 09:25 | 25 | [471] Johan Nikles v Aziz Dougaz [353] | 2-6,7-6,3-6 | |
| ITF - Genova M15 | 06/20 08:00 | 29 | Johan Nikles v Luca Nardi | 4-6,2-6 | |
| ITF - Genova M15 | 06/19 15:00 | 28 | Edoardo Eremin v Johan Nikles | 2-6,3-6 | |
| ITF - Genova M15 | 06/18 11:30 | 27 | Johan Nikles v Dragos Nicolae Madaras | 7-5,3-6,7-5 | |
| ITF - Genova M15 | 06/17 08:00 | 26 | Johan Nikles v Pedro B Dias | 6-3,6-3 | |
| ITF - Genova M15 | 06/16 08:00 | 25 | Johan Nikles v Maxime Mora | 6-2,6-0 | |
| ITF - Vic M25 | 05/19 11:40 | 25 | [470] Johan Nikles v Roberto Ortega-Olmedo [301] | Retired | |
| ITF - Vic M25 | 05/18 09:35 | 62 | Johan Nikles v Miguel Damas | 6-3,7-6 |
Johan Nikles (born 23 March 1997) is a Swiss tennis player.
Nikles has a career high ATP singles ranking of World No. 256 achieved on 11 July 2022. He also has a career high ATP doubles ranking of World No. 357 achieved on 3 October 2022.
On the junior tour, Nikles has a career high ITF junior ranking of No. 26 achieved in January 2015.
Nikles made his ATP main draw debut at the 2016 Swiss Open Gstaad, receiving a singles main draw wildcard.
He qualified for the 2022 Geneva Open defeating 3rd seed Peter Gojowczyk and 8th seed Lukáš Rosol and won his first ATP singles main draw match against compatriot wildcard Leandro Riedi saving three match balls. He lost to Tallon Griekspoor in the second round. As a result he moved 40 positions up into the top 300.