At the Olympic Stadium: A star-studded field will race for gold in the women's 200: two-time Olympic silver medalist Allyson Felix in her signature event; Carmelita Jeter, who earned silver in the 100; Jamaican Veronica Campbell-Brown, the two-time defending champion; former Longhorn Sanya Richards-Ross, gold medalist in the 400, and Jamaica's Shelly-Ann Fraser-Pryce, gold medalist in the 100. In the women's 400-meter hurdles, Lashinda Demus, who failed to qualify for Beijing, is the world champion and favorite. In the women's long jump, Americans Janay Deloach and Brittney Reese qualified. In the men's 110-meter hurdles, Texans Jason Richardson of Dallas and Aries Merritt, who trains in Bryan, take on the past two Olympic champions -- Cuba's Dayron Robles, gold medalist in Beijing and world record holder, and China's Liu Xiang, gold medalist in Athens.At the Basketball Arena: All four men's quarterfinals will be played: Team USA vs. Australia, Brazil vs. Argentina, France vs. Spain, and Russia vs. Lithuania.At Horse Guards Palace: In beach volleyball, it's an all-American final. Misty May-Treanor and Kerri Walsh Jennings play for a gold medal three-peat against Jen Kessy and April Ross. May-Treanor and Walsh Jennings have won 20 consecutive Olympic matches. Kessy and Ross upset top-seeded Brazil, the reigning world champs.