London Olympics track and field | Men’s and women’s events

Team USA’s Allyson Felix, center, crosses the finish line Wednesday to win gold ahead of Jamaica’s Shelly-Ann Fraser-Pryce, right, in the women’s 200-meter final at the London 2012 Olympics. (Matt Dunham / Associated Press)

Aug. 8, 2012 6:38 PM PT

U.S. track and field athletes win three of four events and seven of 12 medals Wednesday. L.A. native Allyson Felix snags her first individual Olympic gold in 21.88 seconds.

Russia’s Natalya Antyukh, right, jumps the final hurdle ahead of the United States’ Lashinda Demus, left, in the women’s 400-meter hurdles final. Demus won silver. (Anja Niedringhaus / Associated Press)