| 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 - M15 Antália | 03/01 10:55 | 25 | Johan Nikles v Andrea Bacaloni | Retired | |
| ITF - M15 Antália | 02/22 07:00 | 25 | Stefan Popovic v Johan Nikles | 6-3,1-6,6-4 | |
| Challenger - Vílnius | 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 - 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 - 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 - Hamburgo | 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 - Genebra | 05/18 13:25 | 26 | [64] Tallon Griekspoor v Johan Nikles [317] | 6-3,7-5 | |
| ATP - Genebra | 05/17 13:20 | 25 | [301] Leandro Riedi v Johan Nikles [317] | 7-5,6-7,5-7 | |
| ATP - Genebra | 05/15 09:00 | 19 | [294] Johan Nikles v Lukas Rosol [249] | 6-4,6-4 | |
| ATP - Genebra | 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.