Stadium: Hard Court 13 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2019/05/25 07:00 | Kalovelonis, Markos v Hoyt, Evan | 5-7,7-6,4-6 |
| ITF - M15 Héraklion | 2019/05/24 07:00 | Artunedo Martinav. v Kalovelonis, Markos | 6-7,4-6 |
| ITF - M15 Héraklion | 2019/05/23 07:00 | Kalovelonis, Markos v Aidan Mchugh | 6-3,6-4 |
| ITF - M15 Héraklion | 2019/05/22 10:00 | Stergiou, Ioannis v Kalovelonis, Markos | 4-6,2-6 |
| ITF - M15 Tbilisi | 2019/05/03 06:00 | Kalovelonis, Markos v Mark Whitehouse | 6-3,4-6,3-6 |
| ITF - M15 Tbilisi | 2019/05/02 06:00 | Kalovelonis, Markos v Yulik, Viacheslav | 3-6,7-6,6-2 |
| ITF - M15 Tbilisi | 2019/05/01 06:00 | Kalovelonis, Markos v Ben Jones | 3-6,7-6,6-3 |
| Andijan, Singles Qualifying M-ITF-UZB-01A | 2019/04/26 07:00 | Kalovelonis, Markos v Khumoyun Sultanov | 1-6,4-6 |
| ITF - M15 Héraklion | 2019/05/21 08:35 | Nema, Patrik v Lo, Chien Hsun | 6-4,6-3 |
| Nanchang, China | 2019/04/22 04:00 | Akira Santillan v Lo, Chien Hsun | 6-1,6-2 |
| Challenger - Taipei | 2019/04/11 06:30 | Ramkumar Ramanathan v Lo, Chien Hsun | 4-6,6-3,6-2 |
| Challenger - Taipei | 2019/04/08 09:40 | Collin Altamirano v Lo, Chien Hsun | 5-7,7-5,3-6 |
| ITF - M15 Sharm El Sheikh | 2019/03/19 08:00 | Lo, Chien Hsun v Maiga, Riccardo | 6-7,6-3,6-7 |
| ITF - M15 Sharm El Sheikh | 2019/03/13 13:05 | Adrian Bodmer v Lo, Chien Hsun | 6-7,7-5,7-5 |
| ITF - M15 Sharm El Sheikh | 2019/03/07 10:20 | Moundir, Adam v Lo, Chien Hsun | 6-4,6-2 |
| Aktobe, Singles Qualifying M-ITF-KAZ-02A | 2019/02/19 11:05 | Lo, Chien Hsun v Ayap, Sagadat | 6-1,3-6,4-6 |