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:
| Tournament | 2009 | 2010 | 2011 | 2012 |
| --- | --- | --- | --- | --- |
| Grand Slam Tournaments | Grand Slam Tournaments | Grand Slam Tournaments | Grand Slam Tournaments | Grand Slam Tournaments |
| Australian Open | 2R | 3R | QF | 3R |
| French Open | 1R | 1R | 1R | 3R |
| Wimbledon | 2R | W | QF | SF |
| US Open | 1R | 1R | W | 2R |
| Win–Loss | 2–4 | 8–3 | 12–3 | 9–4 |
Question:
what is the 2011 performance for the US open?
Answer:
W