400m Semis-Men More Results All 10000m Run-Men 10000m Run-Women 100m Finals-Men 100m Finals-Women 100m Hurdles Finals-Women 100m Hurdles Prelims-Women 100m Hurdles Semis-Women 100m Prelims-Men 100m Prelims-Women 100m Semis-Men 100m Semis-Women 110m Hurdles Finals-Men 110m Hurdles Prelims-Men 110m Hurdles Semis-Men 1500m Run Finals-Men 1500m Run Finals-Women 1500m Run Semis-Men 1500m Run Semis-Women 200m Finals-Men 200m Finals-Women 200m Prelims-Men 200m Prelims-Women 200m Semis-Men 200m Semis-Women 20K Racewalk-Men 20K Racewalk-Women 3000m Steeplechase Finals-Men 3000m Steeplechase Finals-Women 3000m Steeplechase Semis-Men 3000m Steeplechase Semis-Women 400m Finals -Men 400m Finals -Women 400m Hurdles Finals-Men 400m Hurdles Finals-Women 400m Hurdles Prelims-Men 400m Hurdles Prelims-Women 400m Hurdles Semis-Men 400m Hurdles Semis-Women 400m Prelims-Men 400m Prelims-Women 400m Semis-Men 400m Semis-Women 5000m Run-Men 5000m Run-Women 800m Finals-Men 800m Finals-Women 800m Prellims-Men 800m Prellims-Women 800m Semis-Men 800m Semis-Women Complete Results Decathlon Discus-Men Discus-Women Hammer-Men Hammer-Women Heptathlon High Jump-Men High Jump-Women Javelin-Men Javelin-Women Long Jump-Men Long Jump-Women Pole Vault-Men Pole Vault-Women Shot Put-Men Shot Put-Women Triple Jump-Men Triple Jump-Women Men's 400 Meter Dash Senior - Semi-Final View event records PlaceAthlete NameAffiliationTimeQualReacTimeHeat(Pl) 1Tony McQuayFlorida44.79Q0.2051 (1) 2Greg NixonAsics45.24Q0.1502 (1) 3Calvin Smithadidas45.26Q0.2051 (2) 4Jeremy Warineradidas45.28Q0.1811 (3) 5Miles Smithunattached45.32Q0.2001 (4) 6Jamaal TorrenceNike45.36Q0.1682 (2) 7Michael BerryOregon45.39Q0.2002 (3) 8Kerron ClementNike45.42Q0.2042 (4) 9Joey HughesU S C45.620.1941 (5) 10Bryan MillerTexas A&M45.690.2012 (5) 11Josh ScottNike45.710.1961 (6) 12David NevilleNike45.850.1682 (6) 13Clayton ParrosNorth Carolina46.070.1852 (7) 14Marcus BoydBaylor46.140.1821 (7) 15Jordan BoaseNike46.180.1861 (8) 16Errol NolanHouston46.490.1972 (8)