Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| Challenger Las Vegas | 2018/10/23 18:00 | Sarkissian, Alexander v Jason Jung | 6-7,4-6 |
| Challenger Las Vegas | 2018/10/22 18:00 | Tommy Paul v Sarkissian, Alexander | 6-3,6-3 |
| Challenger Las Vegas | 2018/10/21 19:15 | Glasspool, Lloyd v Sarkissian, Alexander | 4-6,4-6 |
| Challenger Las Vegas | 2018/10/20 22:05 | Johnson, Trevor Allen v Sarkissian, Alexander | 4-6,2-6 |
| Challenger Fairfield | 2018/10/07 17:00 | Sarkissian, Alexander v Tommy Paul | 5-7,2-6 |
| Challenger Fairfield | 2018/10/06 18:55 | Sarkissian, Alexander v Zsombor Piros | 6-4,6-2 |
| Challenger Stockton | 2018/10/04 16:30 | Sarkissian, Alexander v Maxime Janvier | 6-7,0-6 |
| Challenger Stockton | 2018/10/02 17:00 | Sarkissian, Alexander v Banes, Maverick | 6-4,6-7,6-1 |
| Challenger Knoxville | 2018/11/08 16:55 | Evgeny Karlovskiy v Klahn, Bradley | 5-7,6-4,6-4 |
| Challenger Knoxville | 2018/11/06 20:50 | Aragone, JC v Klahn, Bradley | 2-6,6-7 |
| Challenger Charlottesville | 2018/11/03 18:40 | Klahn, Bradley v Tommy Paul | 3-6,3-6 |
| Challenger Charlottesville | 2018/11/02 20:50 | Klahn, Bradley v Fratangelo, Bjorn | 6-3,6-3 |
| Challenger Charlottesville | 2018/10/31 23:35 | Klahn, Bradley v Ward, James | 6-1,6-2 |
| Challenger Charlottesville | 2018/10/30 16:40 | Klahn, Bradley v Denis Yevseyev | 6-3,2-6,6-3 |
| ATP Vienna | 2018/10/20 09:00 | Stakhovsky, Sergiy v Klahn, Bradley | 6-7,6-4,6-4 |
| ATP Stockholm | 2018/10/18 17:30 | Isner, John v Klahn, Bradley | 7-6,6-7,7-6 |