The final is Wednesday, and there will be quite a field lining up alongside 400 champion Richards-Ross and 100 champion Fraser-Pryce, who ran her semifinal in 22.34.
Two-time defending 200 champion Veronica Campbell-Brown of Jamaica, and two-time runner-up Allyson Felix of the U.S. won their semifinals. Also advancing: 100 silver medallist Carmelita Jeter of the U.S.
Campbell-Brown took Heat 1 in 22.32 seconds, with Jeter 0.07 behind.
Felix, who owns three world titles in the 200, won Heat 2 in 22.31.