ITF Turkey F1 01/15 08:00 29 Sieber, Marc v Quinzi, Gianluigi 6-3,3-6,3-6
ITF Turkey F1 01/14 13:00 28 Ryan James Storrie v Sieber, Marc 3-6,3-6
ITF Turkey F1 01/13 12:00 27 Sieber, Marc v Gray, Jonathan 6-2,6-4
ITF Turkey F1 01/12 12:55 26 Sieber, Marc v Eon, Julien 6-1,6-0
ITF Turkey F1 01/09 09:15 25 Sieber, Marc v Alekseenko, Vadim 6-2,6-0
ITF Turkey F1 01/08 07:30 44 Sieber, Marc v Bojanovic, Darko 6-1,6-0
ITF Turkey F1 01/07 07:30 44 Sieber, Marc v Ono, Masayoshi 6-2,6-2
Challenger Bratislava Qual 11/05 09:00 46 Kalenichenko, Danylo v Sieber, Marc 7-6,6-3
Challenger Bratislava Qual 11/04 09:00 45 [416] Altug Celikbilek v Sieber, Marc [360] 7-5,1-6,0-6
Challenger Eckental Qual 10/30 11:20 54 [447] Kern, Robin v Sieber, Marc [360] 6-4,6-2
Challenger Eckental Qual 10/29 16:10 46 [325] Cacic, Nikola v Sieber, Marc [358] 2-6,6-3,1-6
Challenger Eckental Qual 10/28 17:10 45 Kapas, Andriej v Sieber, Marc 6-4,4-6,3-6
Brest, France, Qualifying 10/22 14:45 46 [210] Arnaboldi, Andrea v Sieber, Marc [362] 1-6,6-3,6-3
Brest, France, Qualifying 10/21 10:55 45 Vega Hernandez, David v Sieber, Marc 2-6,4-6
Challenger Ismaning Qual 10/14 13:30 45 Sieber, Marc v Vit Kopriva Walkover
Challenger Ortisei 10/13 13:40 27 Herbert, Pierre-Hugues v Sieber, Marc 7-6,3-6,6-3
Challenger Ortisei 10/12 14:00 26 [394] Sieber, Marc v Brown, Dustin [124] 2-6,7-6,7-6
Challenger Ortisei 10/10 10:30 25 Igor Sijsling v Sieber, Marc 1-6,4-6
Challenger Ortisei Qual 10/09 08:00 54 [298] Edan Leshem v Sieber, Marc [396] 3-6,4-6
Challenger Ortisei Qual 10/08 08:00 46 Zgombic, Fran Zvonimir v Sieber, Marc 7-5,0-6,4-6
Challenger Ortisei Qual 10/07 08:00 45 [419] Konecny, Michal v Sieber, Marc [396] 3-6,6-7
Izmir, Turkey 09/19 07:00 25 [406] Sieber, Marc v Lucas Miedler [335] 6-3,4-6,2-6
Challenger Izmir Qual 09/17 10:40 46 Sieber, Marc v Suluoglu, Sefa 6-0,6-3
Challenger Izmir Qual 09/16 09:20 45 Sieber, Marc v Koray Kirci 6-4,6-2
Istanbul, Turkey 09/12 08:55 25 [75] Jaziri, Malek v Sieber, Marc [381] 6-2,7-6
Challenger Istanbul Qual 09/10 10:35 54 Sieber, Marc v Vadym Ursu 6-3,6-0
Challenger Istanbul Qual 09/09 11:20 46 Sieber, Marc v Griekspoor, Kevin 6-2,6-3
ITF Turkey F32 09/02 12:30 28 Sieber, Marc v Marti, Javier Walkover
ITF Turkey F32 09/01 11:00 27 Wilson Leite v Sieber, Marc 3-6,2-6
ITF Turkey F32 08/31 12:00 26 Felipe M R Alves v Sieber, Marc 3-6,5-7