| ITF M25 Hammamet | 04/16 12:40 | 25 | Evan Furness v Johan Nikles | 6-2,7-5 | |
| ITF M25 Hammamet | 04/11 08:30 | 26 | Johan Nikles v Jerome Kym | 7-6,4-6,1-6 | |
| ITF M25 Hammamet | 04/10 10:10 | 25 | Seita Watanabe v Johan Nikles | 6-7,4-6 | |
| ITF M25 Hammamet | 04/08 13:15 | 62 | Johan Nikles v Matteo Fondriest | 6-3,6-3 | |
| Challenger Barletta | 03/31 10:20 | 14 | Matthew Dellavedova v Johan Nikles | 6-1,7-5 | |
| Challenger Zadar | 03/18 09:00 | 19 | Johan Nikles v Arthur Gea | 1-6,4-6 | |
| Challenger Zadar | 03/17 10:45 | 14 | Matthew Dellavedova v Johan Nikles | Retired | |
| ITF M15 Rovinj | 03/12 12:05 | 25 | Johan Nikles v Stefan Popovic | 6-3,3-6,2-6 | |
| Challenger Lugano | 03/05 17:15 | 25 | Cem Ilkel v Johan Nikles | 6-0,6-3 | |
| ITF M25 Hammamet | 02/21 13:30 | 25 | Johan Nikles v Gabriele Maria Noce | 6-4,1-6,3-6 | |
| ITF M25 Hammamet | 02/20 09:15 | 62 | Johan Nikles v Ivan Kazakov | 7-5,6-4 | |
| ITF M25 Hammamet | 02/19 11:00 | 62 | Johan Nikles v Giammarco Gandolfi | 6-0,3-6,10-3 |
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.