Challenger Ismaning 10/14 09:00 46 라마신, 트리스탄 v Sieber, Marc 6-3,6-2
Challenger Ismaning 10/13 10:25 45 케른, 로빈 v Sieber, Marc 3-6,2-6
Challenger Ortisei 10/06 13:30 45 Sieber, Marc v 올리베티, 알바노 6-4,6-7,4-6
ITF Germany F14 10/04 15:05 26 페라리, 프란세스코 v Sieber, Marc 2-6,6-4,6-3
ITF Germany F14 10/02 10:00 25 Wiskandt, Max v Sieber, Marc 2-6,0-6
ITF Germany F14 10/01 10:00 44 Sieber, Marc v von Der Schulenburg, Henry 6-1,6-2
ITF Germany F14 09/30 11:30 44 Sieber, Marc v Nystroem, Patrick 6-1,7-5
Challenger Sibiu Qual 09/16 12:00 46 프룬자, 니콜라에 v Sieber, Marc 6-4,6-3
Challenger Seville 09/01 16:00 45 [454] Sieber, Marc v 자파타 미랄레스, 베르나베 [276] 6-7,3-6
Challenger Mallorca 08/26 11:30 45 제발로스, 페데리코 v Sieber, Marc 3-6,6-1,6-3
Challenger Meerbusch 08/14 12:30 25 [429] Sieber, Marc v 태틀로트, 조한 세바스티엔 [261] 6-7,6-4,4-6
Meerbusch, Germany, Qualifying 08/13 09:00 54 [348] 라마신, 트리스탄 v Sieber, Marc [429] 6-7,5-7
Meerbusch, Germany, Qualifying 08/12 09:40 46 Sieber, Marc v 오에츠바치, 아드리안 6-0,6-0
Meerbusch, Germany, Qualifying 08/11 11:45 45 로센크란즈, 매츠 v Sieber, Marc 3-6,3-6
Challenger Pullach Qual 08/04 09:00 45 [429] Sieber, Marc v 렌즈, 줄리안 [479] 4-6,6-4,4-6
Challenger Liberec Qual 07/29 08:30 46 Sieber, Marc v Moeller, Marvin 2-6,5-7
Challenger Liberec Qual 07/28 08:00 45 [354] 피코비치, 주안 파블로 v Sieber, Marc [439] 3-6,6-3,3-6
Challenger Prague 07/24 11:30 25 [264] 네도비에소브, 알렉산들 v Sieber, Marc [439] 6-0,6-4
Challenger Prague Qual 07/23 10:10 54 [407] 토레브코, 피터 v Sieber, Marc [439] 1-6,4-6
Challenger Prague Qual 07/22 14:10 46 [482] 켈로브스키, 도미니크 v Sieber, Marc [447] 3-6,6-7
Challenger Prague 07/21 14:05 45 페르치코트, 마튜 v Sieber, Marc 6-1,2-6,3-6
ITF Germany F8 07/19 09:30 26 [447] Sieber, Marc v 헤이만, 크리스토펠 [307] 1-6,5-7
ITF Germany F8 07/17 14:05 25 [385] 두라소비치, 빅터 v Sieber, Marc [447] 3-6,2-6
Challenger Caltanissetta 06/12 08:00 25 [146] 아레발로, 마르셀로 v Sieber, Marc [412] 1-6,6-1,7-5
Challenger Caltanissetta Qual 06/11 10:15 54 [326] 소자, 주앙 올라부 v Sieber, Marc [412] 6-2,3-6,4-6
Challenger Caltanissetta Qual 06/10 11:30 46 [410] Sieber, Marc v 시아스, 파웰 [408] 6-0,6-1
Challenger Caltanissetta Qual 06/09 13:25 45 Balmashev, Mikhail v Sieber, Marc 0-6,1-6
Challenger Prostejov Qual 06/03 15:25 46 [410] Sieber, Marc v 사트랄, 잔 [365] 6-4,3-6,4-6
Challenger Prostejov Qual 06/03 09:45 45 네제들리, 파벨 v Sieber, Marc 1-6,5-7
ITF Hungary F2 05/18 08:00 28 발쿠즈, 메이트 v Sieber, Marc 6-1,6-1