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 |
| --- | --- | --- | --- | --- |
| September 25, 2000 | Kawaguchi [ disambiguation needed ] | Hard | Leigh Holland | 6–1, 6–2 |
| January 8, 2001 | Jorhat | Clay | Fabio Maggi | 7–6, 7–5 |
| October 8, 2001 | Santo Domingo | Clay | José de Armas | 6–4, 6–0 |
| January 21, 2002 | Dubai | Hard | Jaroslav Levinský | W/O |
| August 25, 2003 | Enschede | Clay | Robert Lindstedt | 6–3, 3–6, 6–3 |
| November 1, 2004 | Bangkok | Hard | Ruben de Kleijn | 6–4, 6–0 |
| June 27, 2005 | Heerhugowaard | Clay | Nicolas Todero | 6–4, 6–2 |
| July 4, 2005 | Kassel | Clay | Sascha Kloer | 6–2, 6–1 |
| September 3, 2007 | Düsseldorf | Clay | Andreas Haider-Maurer | 6–7, 6–2, 6–4 |
| November 5, 2007 | Eckental | Carpet | Roko Karanušić | W/O |
| November 3, 2008 | Eckental | Carpet | Roko Karanušić | 6–2, 7–5 |
| May 23, 2010 | Cremona | Hard | Marius Copil | 6–4, 7–5 |
| July 5, 2010 | Scheveningen | Clay | Thomas Schoorel | 7–5, 6–4 |
| July 19, 2010 | Poznań | Clay | Andrey Kuznetsov | 6–1, 6–2 |
Question:
What is the surface of the tournament with Sascha Kloer as the opponent?
Answer:
Clay