She struggled to cross the line in third place behind the winner Christine Ohuruogu of Great Britain and Shericka Williams of Jamaica .
Then with 75 meters to go Sanya Richards hamstring tightened up on her .
Sanya Richards struggled to cross the line in third place behind the winner Christine Ohuruogu of Great Britain and Shericka Williams of Jamaica .
Then with 75 meters to go Sanya Richards hamstring tightened up on her .