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 |
| --- | --- | --- | --- | --- |
| November 25, 2002 | Aruba F1 | Clay | Jean-Julien Rojer | 2–6, 2–6 |
| August 18, 2003 | Poland F1 | Clay | Kim Tiilikainen | 6–4, 1–6, 3–6 |
| October 30, 2006 | Iran F5 | Clay | Adam Vejmělka | 6–1, 2–6, 2–6 |
| April 12, 2010 | León , Mexico | Clay | Santiago González | 3–6, 6–1, 7–5 |
| November 29, 2010 | Helsinki , Finland | Hard | Ričardas Berankis | 6–1, 2–0 ret. |
Question:
Which tournament had a hard surface?
Answer:
Helsinki , Finland