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:
| Player | Ranking | Event | Surface | Round | Score |
| --- | --- | --- | --- | --- | --- |
| 2008 WTA Tour | 2008 WTA Tour | 2008 WTA Tour | 2008 WTA Tour | 2008 WTA Tour | 2008 WTA Tour |
| Anna Chakvetadze | No. 6 | Miami , United States | Hard | 3rd Round | 7–5, 6–1 |
| 2009 WTA Tour | 2009 WTA Tour | 2009 WTA Tour | 2009 WTA Tour | 2009 WTA Tour | 2009 WTA Tour |
| Venus Williams | No. 5 | Charleston , United States | Clay (green) | 3rd Round | 6–4, 7–6 (7–5) |
| Svetlana Kuznetsova | No. 5 | Wimbledon , United Kingdom | Grass | 3rd Round | 6–2, 7–5 |
| Caroline Wozniacki | No. 9 | Wimbledon , United Kingdom | Grass | 4th Round | 6–4, 6–4 |
| 2011 WTA Tour | 2011 WTA Tour | 2011 WTA Tour | 2011 WTA Tour | 2011 WTA Tour | 2011 WTA Tour |
| Li Na | No. 6 | Stuttgart , Germany | Clay (i) | 2nd Round | 6–4, 7–5 |
| Li Na | No. 4 | Wimbledon , United Kingdom | Grass | 2nd Round | 3–6, 6–4, 8–6 |
| Marion Bartoli | No. 9 | Wimbledon , United Kingdom | Grass | Quarterfinals | 6–4, 6–7 (7–9) , 6–1 |
| Samantha Stosur | No. 10 | Stanford , United States | Hard | 2nd Round | 6–3, 7–5 |
| 2012 WTA Tour | 2012 WTA Tour | 2012 WTA Tour | 2012 WTA Tour | 2012 WTA Tour | 2012 WTA Tour |
| Maria Sharapova | No. 1 | Wimbledon , United Kingdom | Grass | 4th Round | 6–4, 6–3 |
| 2013 WTA Tour | 2013 WTA Tour | 2013 WTA Tour | 2013 WTA Tour | 2013 WTA Tour | 2013 WTA Tour |
| Serena Williams | No. 1 | Wimbledon , United Kingdom | Grass | 4th Round | 6–2, 1–6, 6–4 |
| Agnieszka Radwańska | No. 4 | Wimbledon , United Kingdom | Grass | Semifinals | 6–4, 2–6, 9–7 |
Question:
Which Surface has a Round of 4th round, and a Player of maria sharapova?
Answer:
Grass