Olympic Champion Miller finished 4th after leading the race for 380, Defending Champion Allyson Felix in third place
1. Phyllis FRANCIS USA 49.92 PB
2. Salwa Eid NASER BRN 50.06 NR
3. Allyson FELIX USA 50.08
4. Shaunae MILLER-UIBO BAH 50.49
5. Shericka JACKSON JAM 50.76
6. Stephenie Ann MCPHERSON JAM 50.86
7. Kabange MUPOPO ZAM 51.15
8. Novlene WILLIAMS-MILLS JAM 51.48