Round: 44 Ground: Hardcourt outdoor
| Las Vegas, Singles M-ITF-USA-07A | 2020/03/02 18:00 | Gessner, Lucas v Alex Kobelt | 6-7,2-6 |
| Sao Paulo, Singles M-ITF-BRA-06A | 2019/10/14 14:00 | Gessner, Lucas v Okano, Joao Pedro | 6-1,1-6,10-12 |
| ITF M25 Rio de Janeiro | 2019/10/07 14:00 | Gessner, Lucas v Iamachkine, Pedro | 1-6,1-6 |
| ITF - M15 Santiago | 2019/09/30 12:00 | Bianchi, Nicolas v Gessner, Lucas | 6-2,6-0 |
| Buenos Aires, Singles Qualifying M-ITF-ARG-22A | 2019/09/15 14:00 | Uryson, Nicolas v Gessner, Lucas | 6-2,6-4 |
| Curitiba, Singles M-ITF-BRA-04A | 2019/06/24 15:55 | Gessner, Lucas v Force, Charles | 6-0,5-7,9-11 |
| Sao Jose Do Rio Preto, Singles M-ITF-BRA-03A | 2019/06/17 16:00 | Miele, Andre v Gessner, Lucas | 6-2,6-2 |
| ITF M15 Cancun | 2019/06/10 19:00 | Mwendwa Mbithi v Gessner, Lucas | 6-2,6-2 |
| Te Anau, Simples M-ITF-NZL-01A | 2019/12/31 05:15 | Sam Ryan Ziegann v Sekiguchi, Shuichi | 2-6,3-6 |
| Toowoomba, Simples M-ITF-AUS-08A | 2019/10/05 23:30 | Horton, Nicholas v Sam Ryan Ziegann | 7-6,0-6,14-12 |
| Brisbane, Simples M-ITF-AUS-07A | 2019/09/29 02:00 | Sam Ryan Ziegann v Horton, Nicholas | 2-6,4-6 |
| ITF M15 Cancun | 2019/09/09 15:00 | Sam Ryan Ziegann v Ryotaro Matsumura | 2-6,3-6 |
| ITF M15 Cancun | 2019/08/26 14:30 | Ma, Jiaxi v Sam Ryan Ziegann | 6-2,2-6,10-2 |
| ITF M15 Cancun | 2019/08/19 14:30 | Ma, Jiaxi v Sam Ryan Ziegann | 3-6,6-3,10-6 |
| ITF M15 Anseong | 2019/06/25 01:00 | Ha Yeon, Sung v Sam Ryan Ziegann | 7-5,6-1 |
| ITF M15 Anseong | 2019/06/24 01:00 | Nordstrom, Per v Sam Ryan Ziegann | 3-6,2-6 |