Neil Walker qualified first for finals with a 48.55; at the 50 Walker was .38 ahead of world record pace with a blistering 22.95. Matt Biondi is the only America to go faster than Walker; Walker's time is only .13 off Biondi's 12-year-old American record.
Walker, 24 and representing Texas, was followed by Gary Hall Jr., the silver medalist in this event at the last Olympics, with a 48.92. Next was Josh Davis, the 200 free champion at this meet, in 49.20. Fourth qualifier was Anthony Ervin, 19 and Hall's teammate at Phoenix Swim Club, in 49.37. Scott Tucker qualified fifth in 49.39, Jason Lezak was sixth in 49.64, Jamie Rauch was seventh in 49.95 and Sabir Muhammad was eighth in 49.96. The top six finishers in this event qualify for the Olympic 400 free relay team.
For live results feeds check the OMEGA TIMING site.
Full results and schedule of events are available from US Swimming