Tim Binning, TheSwimPictures, contributed these photos.
Elizabeth Beisel will be the top seed heading into finals tonight with her time of 4:40.17 in the 400 IM at the 2013 World Championship Trials.
Chase Kalisz, of NBAC, won the 400 IM at prelims this morning with a time of 4:16.28.
World Record holder, Dana Vollmer, had the top time of the morning in her 100 fly with a 57.75.
Ryan Lochte won the prelims of the 100 butterfly with a time of 52.08 on day 3 of the 2013 World Championship Trials.
World Record Holder, Jessica Hardy, qualifies first going into the finals of the 50 breaststroke tonight with a time of 30.39 at the 2013 World Championship Trials.
Rachel Bootsma won the prelims of the 50 backstroke in 27.82 this morning at the 2013 World Championship Trials.
David Plummer is the top seed in the 50 backstroke with a time of 24.80 at the 2013 World Championship Trials.