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 |
| --- | --- | --- | --- | --- |
| 5 September 2005 | Bagneres-De-Bigorre | Hard | Philipp Hammer | 7–6 6 , 7–5 |
| 17 August 2009 | Geneva | Clay | Benjamin Balleret | 6–3, 6–1 |
| 25 April 2010 | Curitiba | Clay | Ricardo Mello | 6–4, 6–7 3 , 6–2 |
| 13 March 2011 | Kyoto | Carpet (i) | Cedrik-Marcel Stebe | 4–6, 6–4, 6–2 |
| 29 July 2012 | Oberstaufen | Clay | Nils Langer | 6–4, 6–3 |
Question:
Which surface was played during Curitiba tournament?
Answer:
Clay