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 |
| --- | --- | --- | --- | --- |
| July 13, 1998 | Aptos | Hard | Takao Suzuki | 6–7, 6–3, 6–2 |
| November 9, 1998 | Las Vegas | Hard | Maurice Ruah | 7–5, 6–3 |
| November 23, 1998 | Burbank | Hard | David Nainkin | 7–6, 7–5 |
| December 6, 1999 | Burbank | Hard | Alex O'Brien | 7–5, 6–3 |
| May 31, 2004 | Tallahassee | Hard | Björn Rehnquist | 6–4, 4–6, 7–5 |
| May 30, 2005 | Yuba City | Hard | Paul Goldstein | 6–4, 6–4 |
| September 11, 2006 | New Orleans | Hard | Amer Delic | 6–3, 7–6 |
Question:
What is the tournament surface at Aptos?
Answer:
Hard