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:
| !Event | Round | Surface | Winner | Opponent | Result |
| --- | --- | --- | --- | --- | --- |
| 1.0 | Wimbledon | Final | Grass | Roger Federer | Andy Roddick |
| 2.0 | Madrid | Semifinal | Clay | Rafael Nadal | Novak Djokovic |
| 3.0 | Australian Open | Semifinal | Hard | Rafael Nadal | Fernando Verdasco |
| 4.0 | US Open | 2nd Round | Hard | Taylor Dent | Iván Navarro |
| 5.0 | Tour Finals | Semifinal | Hard (i) | Nikolay Davydenko | Roger Federer |
Question:
Which Surface has an Opponent of rafael nadal, and an Event of 2?
Answer:
Semifinal