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