Stadium: Ken Rosewall Arena Round: 25 Ground: Hardcourt outdoor
| Challenger Marbella | 2018/03/28 11:10 | Martin Klizan v Alexei Popyrin | 6-4,7-5 |
| ATP Shanghai | 2018/10/07 06:55 | Martin Klizan v Taylor Fritz | 6-3,3-6,4-6 |
| ATP Shanghai | 2018/10/06 06:10 | Martin Klizan v Rigele Te | 6-3,6-4 |
| ATP Tokyo | 2018/10/03 08:05 | Daniil Medvedev v Martin Klizan | 6-4,6-3 |
| ATP Tokyo | 2018/10/01 07:05 | Martin Klizan v Steve Johnson | 6-4,7-6 |
| ATP Tokyo | 2018/09/30 03:00 | Martin Klizan v Bradley Klahn | 6-3,6-4 |
| ATP Tokyo | 2018/09/29 06:20 | Martin Klizan v Prajnesh Gunneswaran | 6-4,6-2 |
| ATP St Petersburg | 2018/09/23 13:30 | Dominic Thiem v Martin Klizan | 6-3,6-1 |
| ATP St Petersburg | 2018/09/22 11:00 | Stan Wawrinka v Martin Klizan | 6-4,3-6,5-7 |
| Challenger Tiburon | 2018/09/27 19:55 | Alexei Popyrin v James Duckworth | 6-4,6-7,6-7 |
| Challenger Tiburon | 2018/09/25 23:15 | Marc Polmans v Alexei Popyrin | 4-6,4-6 |
| Challenger Columbus | 2018/09/21 14:00 | Alexei Popyrin v Michael Mmoh | 4-6,3-6 |
| Challenger Columbus | 2018/09/19 14:00 | Alexei Popyrin v Steven Diez | 6-3,7-5 |
| Challenger Columbus | 2018/09/17 16:35 | Alexei Popyrin v Roberto Ortega-Olmedo | 4-6,7-6,7-5 |
| Challenger Cary | 2018/09/12 19:50 | Alexei Popyrin v Dominik Koepfer | 7-6,6-7,6-7 |
| Challenger Cary | 2018/09/11 20:45 | Alexei Popyrin v JC Aragone | 6-3,6-4 |
| Challenger Chicago | 2018/09/06 15:00 | Noah Rubin v Alexei Popyrin | 5-7,6-2,7-5 |