| 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 M25 Oviedo | 09/02 10:20 | 27 | [410] Johan Nikles v Alvaro Lopez San Martin [398] | 6-7,6-4,5-7 | |
| ITF M25 Oviedo | 09/01 14:20 | 26 | Johan Nikles v Julio Cesar Porras | 7-5,6-4 | |
| ITF M25 Oviedo | 08/31 10:00 | 25 | [410] Johan Nikles v Federico Zeballos [244] | 7-6,6-2 | |
| Challenger Warsaw | 08/25 10:30 | 25 | [409] Johan Nikles v Jozef Kovalik [121] | 3-6,4-6 | |
| Challenger Warsaw | 08/24 11:30 | 19 | Johan Nikles v Jonathan Mridha | 6-4,6-7,6-3 | |
| Challenger Warsaw | 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 M25 The Hague | 07/03 08:00 | 28 | [335] Javier Barranco Cosano v Johan Nikles [458] | 7-5,6-4 | |
| ITF M25 The Hague | 07/02 10:30 | 27 | [436] Mateus D C C Alves v Johan Nikles [458] | 2-6,6-7 | |
| ITF M25 The Hague | 07/01 10:50 | 26 | [458] Johan Nikles v Julian Ocleppo [355] | 6-4,6-1 | |
| ITF M25 The Hague | 06/30 13:50 | 25 | [458] Johan Nikles v Louis Wessels [470] | Retired | |
| ITF M25 Klosters | 06/23 09:25 | 25 | [471] Johan Nikles v Aziz Dougaz [353] | 2-6,7-6,3-6 | |
| ITF M15 Genova | 06/20 08:00 | 29 | Johan Nikles v Luca Nardi | 4-6,2-6 | |
| ITF M15 Genova | 06/19 15:00 | 28 | Edoardo Eremin v Johan Nikles | 2-6,3-6 | |
| ITF M15 Genova | 06/18 11:30 | 27 | Johan Nikles v Dragos Nicolae Madaras | 7-5,3-6,7-5 | |
| ITF M15 Genova | 06/17 08:00 | 26 | Johan Nikles v Pedro B Dias | 6-3,6-3 | |
| ITF M15 Genova | 06/16 08:00 | 25 | Johan Nikles v Maxime Mora | 6-2,6-0 | |
| ITF M25 Vic | 05/19 11:40 | 25 | [470] Johan Nikles v Roberto Ortega-Olmedo [301] | Retired | |
| ITF M25 Vic | 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.