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 | Score |
| --- | --- | --- | --- | --- |
| 30 May 2006 | Turin , Italy | Clay | Marcel Granollers | 6–3, 6–3 |
| 31 July 2007 | Trani , Italy | Clay | Pablo Andújar | 4–6, 6–2, 6–4 |
| 4 September 2007 | Genoa , Italy | Clay | Gianluca Naso | 6–2, 6–7 (4–7) , 7–5 |
| 1 January 2008 | Nouméa , New Caledonia | Hard | Stéphane Bohli | 6–4, 7–5 |
| 6 February 2011 | Burnie , Australia | Hard | Chris Guccione | W/O |
Question:
When was Pablo Andújar the opponent?
Answer:
31 July 2007