Swimming Day 4 preview: Lilly King, Ryan Murphy eye repeat golds; Regan Smith on WR watch Getty Images Getty Images Ariarne Titmus and Katie Ledecky react after competing in the Women's 400m freestyle final in Tokyo. By: Eric Goodman and last updated 2021-07-26 20:54:19-04 Three of Team USAâs brightest swimming stars chase gold medals on the fourth day of competition from the Tokyo Aquatics Center. The medal races come thick and fast on Tuesday, with all four finals taking place consecutively, book-ended by a trio of semifinals. Watch the action LIVE on NBC beginning at 9:30 p.m. ET, or stream the entire session LIVE on NBCOlympics.com and the NBC Sports app.