Ilia Kushev defeated David Klier 6-3 6-0 in the Bulgaria 1 2 semi-final on clay. The upset overturned the form book — David Klier came in leading the head-to-head 1–0. Ilia Kushev claimed a first win over David Klier in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-01 | Bulgaria 1 1 | QF | clay | David Klier | 6-3 6-1 |