Sarah Hammer

Sarah Hammer of the United States is in good shape in the Omnium. (Sergey Ponomarev -- Associated Press)

Sarah Hammer of the United States is in good shape in the Omnium. (Sergey Ponomarev — Associated Press)

Sarah Hammer, of the United States, competes in the women’s omnium flying lap event, during the 2012 Summer Olympics, Monday, Aug. 6, 2012, in London. (AP Photo/Sergey Ponomarev)