Stadium: Cancha La Aficion Round: 25 Ground: Hardcourt outdoor
| Challenger Guadalajara Qual | 2018/04/15 20:05 | Brydan Klein v James Ward | 5-7,4-6 |
| Challenger Guadalajara Qual | 2018/04/14 22:10 | Andrew Harris v Brydan Klein | 2-6,7-5,6-7 |
| ITF Japan F1 | 2018/03/07 06:00 | Soichiro Moritani v Brydan Klein | 7-6,7-5 |
| Challenger Yokohama Qual | 2018/02/24 05:00 | Brydan Klein v Makoto Ochi | 4-6,6-7 |
| Challenger Kyoto | 2018/02/21 01:30 | John Millman v Brydan Klein | 7-6,6-7,6-3 |
| Challenger Kyoto | 2018/02/20 01:30 | Brydan Klein v Ze Zhang | 6-3,3-6,7-6 |
| Challenger Launceston | 2018/02/06 02:25 | Brydan Klein v Marinko Matosevic | 4-6,6-4,6-7 |
| Challenger Burnie | 2018/01/29 01:05 | Andrew Whittington v Brydan Klein | 6-7,7-6,6-2 |
| Challenger Puerto Vallarta Qual | 2018/04/29 17:40 | Hans Hach Verdugo v Felipe Mantilla | 6-2,1-6,5-7 |
| Challenger Puerto Vallarta Qual | 2018/04/28 21:00 | Antonio Ruiz-Rosales v Felipe Mantilla | 2-6,4-6 |
| Challenger Leon Qual | 2018/04/22 16:00 | Felipe Mantilla v Tobias Simon | 5-7,3-6 |
| Challenger Leon Qual | 2018/04/21 16:55 | Felipe Mantilla v Mauricio Echazu | 6-3,7-5 |
| Challenger Guadalajara Qual | 2018/04/15 17:40 | Alejandro Gonzalez v Felipe Mantilla | 7-6,7-6 |
| Challenger Guadalajara Qual | 2018/04/14 20:30 | Felipe Mantilla v Tobias Simon | 7-5,7-6 |
| Challenger Mexico City Qual | 2018/04/08 20:00 | Felipe Mantilla v Juan Ignacio Londero | 4-6,3-6 |
| Challenger Mexico City Qual | 2018/04/07 21:20 | Felipe Mantilla v Emilio Gomez | 6-7,6-0,6-3 |