A day of "firsts" in the semi finals of the World Championships, in Kaohsiung, Taiwan

Aug. 22, 2013, 12 a.m. (ET)

Left to Right, Grace Kittle wins the women's swim, Margaux Isaksen takes her semifinal, Logan Storie wins the men's swim and Nathan Schrimsher takes his semifinal. Both Margaux and Nathan qualified for the finals. A good day for Team USA.