Challenger Fergana 06/20 08:15 26 [289] Aldin Setkic v Duckhee Lee [233] 6-2,6-3
Challenger Fergana 06/18 09:05 25 [312] Yusuke Takahashi v Duckhee Lee [233] 6-7,1-6
Challenger Almaty 06/12 07:40 25 [229] Duckhee Lee v Roberto Cid Subervi [248] 5-7,5-7
French Open Qual 05/25 08:00 46 [155] Jaume Munar v Duckhee Lee [242] 6-7,6-0,7-6
French Open Qual 05/23 14:40 45 [242] Duckhee Lee v Lorenzo Sonego [126] 6-3,6-4
French Open Qual 05/21 12:10 44 [186] Dennis Novikov v Duckhee Lee [242] 2-6,2-6
Challenger Busan 05/17 05:20 26 [188] Filip Peliwo v Duckhee Lee [246] 4-6,6-2,6-4
Challenger Busan 05/14 07:45 25 [278] Yusuke Takahashi v Duckhee Lee [246] 2-6,1-6
Challenger Gimcheon 05/08 06:55 25 [216] Duckhee Lee v Luke Saville [456] 7-6,2-6,3-6
Challenger Gimcheon 05/08 06:55 - Duckhee Lee v Yen-Hsun Lu Cancelled
Challenger Seoul 05/01 07:05 25 [172] Tatsuma Ito v Duckhee Lee [219] 6-1,6-3
Challenger Anning 04/26 04:35 26 Sasi Kumar Mukund v Duckhee Lee 6-2,7-6
Challenger Anning 04/24 06:20 25 Duckhee Lee v Rui-Xuan Wang 6-2,7-6
Challenger Nanchang 04/16 03:00 25 [212] Duckhee Lee v Jordan Thompson [99] 2-6,1-6
ITF Japan F5 04/03 05:35 25 Duckhee Lee v Yuta Kawahashi 6-7,6-7
Challenger Qujing 03/20 02:00 25 [206] Duckhee Lee v Hubert Hurkacz [178] 3-6,3-6
Challenger Shenzhen 03/15 09:20 26 Malek Jaziri v Duckhee Lee 6-2,6-2
Challenger Shenzhen 03/13 05:55 25 Jason Jung v Duckhee Lee 6-4,5-7,4-6
Challenger Yokohama 02/28 01:30 26 Duckhee Lee v Cem Ilkel 2-6,6-2,6-7
Challenger Yokohama 02/27 02:20 25 Duckhee Lee v Tim Puetz 4-6,6-4,6-3
Challenger Chennai 02/16 05:30 28 Duckhee Lee v Yuki Bhambri 5-7,2-6
Challenger Chennai 02/15 05:30 27 Antoine Escoffier v Duckhee Lee 2-6,6-3,3-6
Challenger Chennai 02/14 04:30 26 Abhinav Sanjeev Shanmugam v Duckhee Lee 2-6,4-6
Challenger Chennai 02/12 07:00 25 N. Vijay Sundar Prashanth v Duckhee Lee 3-6,4-6
ITF China F3 01/23 05:45 25 Duckhee Lee v Huixin Wang 1-6,3-6
Australian Open Qual 01/14 00:45 46 Ruben Bemelmans v Duckhee Lee 6-4,6-4
Australian Open Qual 01/13 01:30 45 Duckhee Lee v Frank Dancevic 4-6,7-6,6-3
Australian Open Qual 01/10 06:40 44 Ze Zhang v Duckhee Lee 3-6,6-3,3-6
Challenger Bangkok 01/05 05:15 27 Duckhee Lee v Marcel Granollers 2-6,4-6
Challenger Bangkok 01/03 03:00 26 Yannick Maden v Duckhee Lee Walkover