| TT Star Series | 04/23 10:00 | - | Akito Itagaki v Stefan Kostadinovic | L | 3-0 | |
| TT Star Series | 04/23 08:30 | - | Adam Klajber v Stefan Kostadinovic | L | 3-1 | |
| TT Star Series | 04/23 07:00 | - | Stefan Kostadinovic v Tibor Spanik | L | 1-3 | |
| TT Star Series | 04/22 13:00 | - | Stefan Kostadinovic v Mohammed Javad Sohrabi | L | 1-3 | |
| TT Star Series | 04/22 11:30 | - | Jakub Zelinka v Stefan Kostadinovic | L | 3-2 | |
| TT Star Series | 04/22 09:30 | - | Jiri Vrablik v Stefan Kostadinovic | W | 2-3 | |
| TT Star Series | 04/22 07:00 | - | Miroslav Horejsi v Stefan Kostadinovic | L | 3-0 | |
| TT Star Series | 04/20 16:39 | - | Stefan Kostadinovic v Nazar Tretiak | L | 2-3 | |
| TT Star Series | 04/20 15:41 | - | Stefan Kostadinovic v Miroslav Horejsi | L | 1-3 | |
| TT Star Series | 04/20 15:30 | - | Stefan Kostadinovic v Antonin Gavlas | L |
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| TT Star Series | 04/19 18:06 | - | Martin Pytlik v Stefan Kostadinovic | W | 0-3 | |
| TT Star Series | 04/19 16:20 | - | Daniel Rinderer v Stefan Kostadinovic | L | 3-1 | |
| TT Star Series | 04/19 15:00 | - | Stefan Kostadinovic v Jiri Vrablik | L | 1-3 | |
| TT Star Series | 04/19 14:57 | - | Stefan Kostadinovic v Matej Stach | W | 3-0 | |
| TT Star Series | 08/15 11:45 | - | Stefan Kostadinovic v Dmitrij Prokopcov | L | 1-3 | |
| TT Star Series | 08/15 08:45 | - | Stefan Kostadinovic v Francisco Sanchi | L | 1-3 | |
| TT Star Series | 08/15 06:35 | - | Stefan Kostadinovic v Jiri Martinko | L | 1-3 | |
| TT Star Series | 08/14 12:45 | - | Stefan Kostadinovic v Jong-Eon Yeon | W | 3-2 | |
| TT Star Series | 08/14 10:15 | - | Stefan Kostadinovic v Tomas Tregler | W | 3-1 | |
| TT Star Series | 08/14 08:15 | - | Stefan Kostadinovic v Amirreza Abbasi | L | 0-3 | |
| TT Star Series | 08/14 06:00 | - | Stefan Kostadinovic v Josip Huzjak | L | 1-2 | |
| TT Star Series | 01/14 11:45 | - | Stefan Kostadinovic v Frantisek Onderka | L | 2-3 | |
| TT Star Series | 01/14 10:15 | - | Stefan Kostadinovic v Radim Bako | L | 1-3 | |
| TT Star Series | 01/14 08:45 | - | Stefan Kostadinovic v Yannick Vostes | L | 1-3 | |
| TT Star Series | 01/13 13:15 | - | Josef Braun v Stefan Kostadinovic | W | 0-3 | |
| TT Star Series | 01/13 11:15 | - | Amirreza Abbasi v Stefan Kostadinovic | L | 3-2 | |
| TT Star Series | 01/13 09:45 | - | Stefan Kostadinovic v Abdel Kader Salifou | W | 3-1 | |
| Balkan Champs MS | 08/03 12:45 | - | Stefan Kostadinovic v Daniele Pinto | W | 4-1 | |
| Balkan Champs MS | 08/02 15:00 | - | Stefan Kostadinovic v Fatih Karabaxhak | W | 3-0 | |
| Balkan Champs MS | 08/02 08:55 | - | Dritan Laska v Stefan Kostadinovic | W | 0-3 |