| ITF M15 Antalya | 03/01 10:55 | 25 | Johan Nikles v Andrea Bacaloni | Retired | |
| ITF M15 Antalya | 02/22 07:00 | 25 | Stefan Popovic v Johan Nikles | 6-3,1-6,6-4 | |
| Challenger Vilnius | 10/17 16:35 | 25 | Johan Nikles v Edas Butvilas | 6-3,6-7,1-6 | |
| ATP Gijon | 10/08 17:05 | 14 | [336] Johan Nikles v Nikolas S Izquierdo [275] | 2-6,6-1,1-6 | |
| Challenger Lisbon | 09/25 10:50 | 14 | [275] Johan Nikles v Remy Bertola [448] | Retired | |
| Challenger Sibiu | 09/22 12:45 | 26 | [192] Damir Dzumhur v Johan Nikles [275] | 6-4,6-3 | |
| Challenger Sibiu | 09/20 10:10 | 25 | [258] Kai Wehnelt v Johan Nikles [275] | 4-6,5-7 | |
| Challenger Szczecin | 09/12 10:35 | 19 | [274] Johan Nikles v Rudolf Molleker [397] | 5-7,3-6 | |
| Challenger Szczecin | 09/11 11:10 | 14 | Johan Nikles v Szymon Kielan | 6-2,6-2 | |
| Challenger Toulouse | 08/30 08:30 | 25 | [274] Johan Nikles v Louis Wessels [294] | 3-6,6-2,5-7 | |
| Challenger Banja Luka | 08/22 14:35 | 25 | [349] Viktor Durasovic v Johan Nikles [268] | 6-0,6-3 | |
| Challenger Zug | 07/25 13:30 | 25 | [261] Johan Nikles v Dimitar Kuzmanov [189] | 4-6,4-6 | |
| ATP Hamburg | 07/16 10:30 | 26 | [117] Daniel Elahi Galan v Johan Nikles [256] | 6-3,6-7,6-1 | |
| Challenger Amersfoort | 07/11 09:00 | 19 | [256] Johan Nikles v Arthur Fils [346] | 2-6,6-7 | |
| Challenger Amersfoort | 07/10 10:10 | 45 | Johan Nikles v Thomaz Bellucci | 6-4,5-7,6-1 | |
| Challenger Troyes | 06/28 13:40 | 25 | [382] Francesco Maestrelli v Johan Nikles [259] | 6-1,7-5 | |
| Challenger Oeiras | 06/23 09:00 | 26 | [260] Johan Nikles v Alex Rybakov [327] | 6-4,4-6,3-6 | |
| Challenger Oeiras | 06/21 10:00 | 25 | [260] Johan Nikles v Ergi Kirkin [305] | 4-6,6-3,6-0 | |
| Challenger Bratislava | 06/09 11:15 | 26 | [146] Vit Kopriva v Johan Nikles [281] | 6-1,6-4 | |
| Challenger Bratislava | 06/07 13:55 | 25 | [255] Vitaliy Sachko v Johan Nikles [281] | 6-3,3-6,4-6 | |
| Challenger Bratislava | 06/06 10:10 | 19 | [281] Johan Nikles v Jonathan Mridha [462] | 6-2,4-6,6-2 | |
| Challenger Bratislava | 06/05 14:05 | 14 | [276] Johan Nikles v Gergely Madarasz [449] | 6-4,7-6 | |
| Challenger Poznan | 05/29 12:35 | 14 | [277] Johan Nikles v Elmar Ejupovic [419] | 3-6,4-6 | |
| ATP Geneva | 05/18 13:25 | 26 | [64] Tallon Griekspoor v Johan Nikles [317] | 6-3,7-5 | |
| ATP Geneva | 05/17 13:20 | 25 | [301] Leandro Riedi v Johan Nikles [317] | 7-5,6-7,5-7 | |
| ATP Geneva | 05/15 09:00 | 19 | [294] Johan Nikles v Lukas Rosol [249] | 6-4,6-4 | |
| ATP Geneva | 05/14 09:00 | 14 | [99] Peter Gojowczyk v Johan Nikles [294] | 3-6,3-6 | |
| Challenger Split | 04/19 08:30 | 25 | [209] Luca Nardi v Johan Nikles [294] | 6-4,6-3 | |
| Challenger Split | 04/18 08:30 | 19 | [294] Johan Nikles v Bogdan Bobrov [470] | 6-4,7-5 | |
| Challenger Split | 04/17 08:00 | 14 | [294] Johan Nikles v Alexandar Lazarov [411] | 6-3,7-5 |
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.