ITF Turkey F32 08/30 12:00 25 리에더, 호스트 v Sieber, Marc 1-6,1-6
ITF Germany F12 08/25 15:10 27 Sieber, Marc v 웨셀스, 루이스 6-3,3-6,4-6
ITF Germany F12 08/24 10:15 26 Sieber, Marc v Schmidt, Gabriel 6-3,6-4
ITF Germany F12 08/23 15:00 25 Sieber, Marc v 링크, 조엘 빈센트 6-4,6-1
Challenger Meerbusch 08/17 11:00 26 Sieber, Marc v 마모운, 카림-모하메드 2-6,3-6
Challenger Meerbusch 08/15 17:00 25 [117] 브라운, 더스틴 v Sieber, Marc [365] 2-6,2-6
Meerbusch, Germany, Qualifying 08/14 09:30 54 [365] Sieber, Marc v 기메노-트라벨, 다니엘 [451] 7-5,6-3
Meerbusch, Germany, Qualifying 08/13 12:55 46 Sieber, Marc v 라자로브, 알렉산달 6-3,6-2
Challenger Marburg Qual 07/02 10:20 54 [375] Sieber, Marc v 바친겔, 마티아스 [402] 2-6,7-6,3-6
Challenger Marburg Qual 07/01 10:00 46 Sieber, Marc v Naow, Amer 6-1,6-2
ITF Turkey F24 06/25 08:00 29 Sieber, Marc v 쿠즈마노브, 디미탈 3-6,6-2,1-6
ITF Turkey F24 06/24 07:00 28 Sieber, Marc v 투르체티, 니콜로 6-3,6-3
ITF Turkey F24 06/23 07:00 27 Sieber, Marc v Haylaz, Muhammet 6-0,6-3
ITF Turkey F24 06/22 07:00 26 Sieber, Marc v 도네브, 가브리엘 6-2,6-1
ITF Turkey F24 06/20 07:00 25 Sieber, Marc v Kahlke, Jannis 6-4,6-1
ITF Turkey F23 06/17 07:00 28 델린, 휴고 v Sieber, Marc 6-3,6-1
ITF Turkey F23 06/16 08:30 27 Gabb, Richard v Sieber, Marc 3-6,3-6
ITF Turkey F23 06/15 07:00 26 Kahlke, Jannis v Sieber, Marc 1-6,2-6
ITF Turkey F23 06/13 08:35 25 [448] 모슬레이, 브라들레이 v Sieber, Marc [339] 3-6,3-6
Challenger Mestre 05/23 09:30 25 [388] 마겔, 기안루카 v Sieber, Marc [312] 7-6,6-3
ITF Turkey F18 05/14 08:00 29 [300] 노바크, 데니스 v Sieber, Marc [301] 6-4,6-4
ITF Turkey F18 05/13 07:30 28 Sieber, Marc v 스토리, 리안 제임스 6-2,6-1
ITF Turkey F18 05/12 07:00 27 [432] 산타나, 브루노 v Sieber, Marc [301] 2-6,3-6
ITF Turkey F18 05/11 07:00 26 Statzberger, Thomas v Sieber, Marc 5-7,0-6
ITF Turkey F18 05/09 07:00 25 데 크롬, 미치엘 v Sieber, Marc 2-6,1-6
ATP Istanbul Qual 04/29 13:25 26 [175] 메넨데즈-마세이라스, 아드리안 v Sieber, Marc [283] 7-5,6-4
Challenger Francavilla 04/24 11:45 25 [172] 나콜리타노, 스테파노 v Sieber, Marc [283] 6-4,1-6,6-4
Turkey F15, Singles Qualifying 04/20 07:00 26 쿠즈마노브, 디미탈 v Sieber, Marc 4-6,6-4,6-2
Turkey F15, Singles Qualifying 04/18 10:55 25 Ladik, Oleg v Sieber, Marc 2-6,0-6
Turkey F14, Singles Qualifying 04/12 07:30 25 바릴라스, 주안 파블로 v Sieber, Marc 2-6,7-5,6-3