| Augsburg, Germany | 08/20 14:10 | 14 | [416] 마주어, 다니엘 v Frantzen, Constantin [98] | 6-3,6-4 | |
| Drummondville, Canada | 11/15 20:45 | 25 | 호르바트, 로코 v Frantzen, Constantin | 7-6,6-1 | |
| Drummondville, Canada | 11/14 15:00 | 19 | Frantzen, Constantin v 스미스, 로이 | 6-7,6-7 | |
| Drummondville, Canada | 11/13 16:35 | 14 | [474] 쿠마르, 옴니 v Frantzen, Constantin [207] | 6-2,5-7,5-7 | |
| ITF M25 Harlingen | 10/18 23:30 | 19 | Frantzen, Constantin v van Orderlain, Drew | 3-6,4-6 | |
| Challenger Columbus | 09/18 16:00 | 14 | [283] Frantzen, Constantin v 트로터, 젬스 켄트 [404] | 0-6,2-6 | |
| ITF M25 Marburg | 07/07 10:15 | 26 | Frantzen, Constantin v 웰트, 밀란 | 6-3,5-7,1-6 | |
| ITF M25 Marburg | 07/06 10:40 | 25 | Alazmeh, Taym v Frantzen, Constantin | 6-7,1-6 | |
| ITF M25 Marburg | 07/05 09:45 | 54 | 웰트, 밀란 v Frantzen, Constantin | 4-6,6-3,5-10 | |
| ITF M25 Marburg | 07/04 11:30 | 54 | Frantzen, Constantin v 시니아코브, 다니엘 | 6-4,6-3 | |
| ITF M25 Arlon | 06/22 08:00 | 25 | Frantzen, Constantin v Hoogmartens, Alexander | 4-6,1-6 | |
| ITF M25 Arlon | 06/21 08:00 | 54 | [447] Sandkaulen, Tim v Frantzen, Constantin [423] | 6-1,4-6,8-10 | |
| ITF M25 Arlon | 06/20 10:40 | 54 | 에르나엘스틴, 빅토르 v Frantzen, Constantin | 3-6,2-6 | |
| ITF M15 Meerbusch | 05/02 08:00 | 62 | Frantzen, Constantin v 데 로시, 마르코 | 3-6,2-6 | |
| ITF M15 Meerbusch | 05/01 07:30 | 62 | Frantzen, Constantin v 케코제비치, 미하일로 | 6-3,6-3 | |
| Split, Singles M-ITF-CRO-05A | 04/25 10:20 | 62 | 페트로비치, 드라젠 v Frantzen, Constantin | 6-4,7-5 | |
| ITF M15 Monastir | 04/06 12:35 | 25 | Frantzen, Constantin v Kielan, Szymon | 3-6,5-7 | |
| ITF M25 Monastir | 04/04 13:30 | 62 | Frantzen, Constantin v 카투치, 야쿠브 | 6-3,6-0 | |
| ITF M25 Monastir | 04/04 09:00 | 62 | Frantzen, Constantin v 스투빙스, 메튜 | 6-1,6-2 | |
| ITF M25 Monastir | 03/27 10:00 | 62 | Frantzen, Constantin v 와타나쿨, 폴 | 6-7,7-5,8-10 | |
| ITF M25 Monastir | 03/23 07:30 | 62 | Herman, Louis v Frantzen, Constantin | 6-2,6-1 | |
| ITF M25 Monastir | 03/20 09:00 | 62 | Frantzen, Constantin v 아우브리오트, 알렉산드레 | 6-3,6-3 | |
| Trimbach, Singles M-ITF-SUI-01A | 03/17 09:00 | 26 | 헤르테스, 조하네스 v Frantzen, Constantin | 6-3,6-7,6-2 | |
| Trimbach, Singles M-ITF-SUI-01A | 03/16 13:55 | 25 | Frantzen, Constantin v 타디아, 레오날도 | 6-4,7-5 | |
| Trimbach, Singles M-ITF-SUI-01A | 03/15 09:00 | 54 | Frantzen, Constantin v 아에른, 라우린 | 3-6,7-6,12-10 | |
| Trimbach, Singles M-ITF-SUI-01A | 03/14 09:00 | 54 | Frantzen, Constantin v Jasin Jakupi | 6-3,6-3 | |
| ITF M25 Glasgow | 02/17 10:00 | 26 | 마투세비치, 안톤 v Frantzen, Constantin | 6-4,6-2 | |
| ITF M25 Glasgow | 02/15 10:00 | 25 | 질, 펠릭스 v Frantzen, Constantin | 7-6,4-6,0-6 | |
| ITF M25 Glasgow | 02/14 09:55 | 54 | 오호이신, 오스가르 v Frantzen, Constantin | 3-6,2-6 | |
| ITF M25 Glasgow | 02/13 11:00 | 54 | Oliver Tarvet v Frantzen, Constantin | Retired |