| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | List of Strikeforce champions - Welterweight Championship |  |  |  |  |
| 3 | No. | Name | Event | Date | Defenses |
| 4 | 1 | United States Nick Diaz def. Marius Žaromskis | Strikeforce: Miami Sunrise, FL, USA | January 30, 2010 | 1. def. |
| 5 | The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC. | The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC. | The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC. | The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC. | The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC. |
| 6 | 2 | United States Nate Marquardt def. Tyron Woodley | Strikeforce: Rockhold vs. Kennedy Portland, OR, USA | July 14, 2012 | - |
| 7 | 3 | Belgium Tarec Saffiedine | Strikeforce: Marquardt vs. Saffiedine Oklahoma City, Oklahoma, USA | January 12, 2013 | - |
| 8 | The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013. | The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013. | The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013. | The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013. | The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013. |

Question: What happened to Nick Diaz's welterweight championship tittle in 2011?
Answer: Nick Diaz vacated his Strikeforce Welterweight Championship title.