| ITF M15 Monastir | 01/15 08:00 | 62 | Nyo Van Dyck v Johan Nikles | 2-6,2-6 | |
| ITF M15 Monastir | 01/14 08:00 | 62 | Johan Nikles v Grigory Shebekin | 6-2,6-2 | |
| ITF M15 Monastir | 01/08 08:00 | 62 | Johan Nikles v Artur Kukasian | 3-6,6-2,5-10 | |
| ITF 15 Antalya | 03/01 10:55 | 25 | Johan Nikles v Andrea Bacaloni | Retired | |
| ITF 15 Antalya | 02/22 07:00 | 25 | Stefan Popovic v Johan Nikles | 6-3,1-6,6-4 | |
| Challenger de Vilna | 10/17 16:35 | 25 | Johan Nikles v Edas Butvilas | 6-3,6-7,1-6 | |
| ATP Gijón | 10/08 17:05 | 14 | [336] Johan Nikles v Nikolas S Izquierdo [275] | 2-6,6-1,1-6 | |
| Challenger de Lisboa | 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 de Szczecin | 09/12 10:35 | 19 | [274] Johan Nikles v Rudolf Molleker [397] | 5-7,3-6 | |
| Challenger de Szczecin | 09/11 11:10 | 14 | Johan Nikles v Szymon Kielan | 6-2,6-2 | |
| Challenger de Toulouse | 08/30 08:30 | 25 | [274] Johan Nikles v Louis Wessels [294] | 3-6,6-2,5-7 | |
| Challenger de Banja Luka | 08/22 14:35 | 25 | [349] Viktor Durasovic v Johan Nikles [268] | 6-0,6-3 | |
| Challenger de Zug | 07/25 13:30 | 25 | [261] Johan Nikles v Dimitar Kuzmanov [189] | 4-6,4-6 | |
| ATP Hamburgo | 07/16 10:30 | 26 | [117] Daniel Elahi Galan v Johan Nikles [256] | 6-3,6-7,6-1 | |
| Challenger de Amersfoort | 07/11 09:00 | 19 | [256] Johan Nikles v Arthur Fils [346] | 2-6,6-7 | |
| Challenger de Amersfoort | 07/10 10:10 | 45 | Johan Nikles v Thomaz Bellucci | 6-4,5-7,6-1 | |
| Challenger de Troyes | 06/28 13:40 | 25 | [382] Francesco Maestrelli v Johan Nikles [259] | 6-1,7-5 | |
| Challenger de Oeiras | 06/23 09:00 | 26 | [260] Johan Nikles v Alex Rybakov [327] | 6-4,4-6,3-6 | |
| Challenger de Oeiras | 06/21 10:00 | 25 | [260] Johan Nikles v Ergi Kirkin [305] | 4-6,6-3,6-0 | |
| Challenger de Bratislava | 06/09 11:15 | 26 | [146] Vit Kopriva v Johan Nikles [281] | 6-1,6-4 | |
| Challenger de Bratislava | 06/07 13:55 | 25 | [255] Vitaliy Sachko v Johan Nikles [281] | 6-3,3-6,4-6 | |
| Challenger de Bratislava | 06/06 10:10 | 19 | [281] Johan Nikles v Jonathan Mridha [462] | 6-2,4-6,6-2 | |
| Challenger de Bratislava | 06/05 14:05 | 14 | [276] Johan Nikles v Gergely Madarasz [449] | 6-4,7-6 | |
| Challenger de Poznan | 05/29 12:35 | 14 | [277] Johan Nikles v Elmar Ejupovic [419] | 3-6,4-6 | |
| ATP Ginebra | 05/18 13:25 | 26 | [64] Tallon Griekspoor v Johan Nikles [317] | 6-3,7-5 | |
| ATP Ginebra | 05/17 13:20 | 25 | [301] Leandro Riedi v Johan Nikles [317] | 7-5,6-7,5-7 | |
| ATP Ginebra | 05/15 09:00 | 19 | [294] Johan Nikles v Lukas Rosol [249] | 6-4,6-4 | |
| ATP Ginebra | 05/14 09:00 | 14 | [99] Peter Gojowczyk v Johan Nikles [294] | 3-6,3-6 |
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.