Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Tournament | Surface | Opponent in the final | Score |
| --- | --- | --- | --- | --- |
| June 26, 2006 | Belgrade | Clay | Ilia Kushev | 6–4, 6–1 |
| August 14, 2006 | Vinkovci | Clay | Dušan Lojda | 3–6, 7–6, 7–5 |
| March 12, 2007 | Accra | Clay | Gabriel Moraru | 6–4, 6–4 |
| March 19, 2007 | Accra | Clay | Adrian Gavrila | 6–4, 6–3 |
| May 14, 2007 | Sarajevo | Clay | Photos Kallias | 7–5, 6–0 |
| May 21, 2007 | Brčko | Clay | Ivan Dodig | 7–5, 7–5 |
| May 28, 2007 | Prijedor | Clay | Blaž Kavčič | 6–3, 6–4 |
| June 4, 2007 | Skopje | Clay | Ivaylo Traykov | 6–3, 6–4 |
| June 11, 2007 | Skopje | Clay | Ivaylo Traykov | 6–3, 6–2 |
| March 31, 2008 | Roma-Frascati | Clay | Giulio Di Meo | 6–3, 4–6, 6–1 |
Question:
When was the Prijedor tournament?
Answer:
May 28, 2007