Prefontaine ClassicWomen 400 Meter Dash1 Allyson FELIX USA 50.052 Sanya RICHARDS-ROSS USA 50.293 Stephenie Ann MCPHERSON JAM 50.404 Phyllis FRANCIS USA 51.375 Natasha HASTINGS USA 51.716 Novlene WILLIAMS-MILLS JAM 51.897 Libania GRENOT ITA 51.918 Christine DAY JAM 52.29