The US Olympic Swimming Trials commenced in Omaha, Nebraska on June 4, with Wave 1 getting off to a flying start.The top two finishers in every final event will advance to Wave 2 trials, which will be held from June 13 to June 20. The two waves will see a combined 1,565 swimmers in action at the US Olympic Swimming Trials. More than 900 swimmers will be a part of Wave 1.It is also mandatory for all swimmers, including those who are fully vaccinated, to undergo an RT-PCR test.EMMA 🔜 #SwimTrials21 Wave IIEmma Sticklen takes 2nd in the 200 fly in a personal-best time of 2:12.58 (just .01 behind winner) to qualify for Wave II. #HookEm 🤘🇺🇸 pic.twitter.com/h6i18k7Jyx— Texas Women's Swimming & Diving (@TexasWSD) June 5, 2021Event qualification time standards at US Olympic Swimming Trials 202150m Freestyle Women:Wave 1: 25.99Wave 2: 25.65Men:Wave 1: 23.19Wave 2: 22.71100m Freestyle Women:Wave 1: 56.29Wave 2: 55.56Men:Wave 1: 50.49Wave 2: 49.74200m Freestyle Women:Wave 1: 2:01.69Wave 2: 2:00.24Men:Wave 1: 1:50.79Wave 2: 1:49.65Read: US Olympic Swimming trials 2021: Event timings, lists and live streaming details400m Freestyle WomenWave 1: 4:16.89Wave 2: 4:13.28Men:Wave 1: 3:57.29Wave 2: 3:54.21800m Freestyle Women:Wave 1: 8:48.09Wave 2: 8:44.01Men:Wave 1: 8:12.99Wave 2: 8:08.951500m FreestyleWomen:Wave 1: 16:49.19Wave 2: 16:44.60Men:Wave 1: 15:44.89Wave 2: 15:35.69100m Backstroke Women:Wave 1: 1:02.69Wave 2: 1:01.49Men:Wave 1: 56.59Wave 2: 55.51200m Backstroke Women:Wave 1: 2:14.69Wave 2: 2:12.94Men:Wave 1: 2:02.99Wave 2: 2:00.81Caleb Dressel will be in action in Wave 2100m BreaststrokeWomen:Wave 1: 1:10.99Wave 2: 1:09.55Men:Wave 1: 1:03.29Wave 2: 1:01.97Also read: Explaining US swimming sensation Caeleb Dressel's tattoos200m BreaststrokeWomen:Wave 1: 2:33.29Wave 2: 2:30.49Men:Wave 1: 2:17.89Wave 2: 2:15.28100m ButterflyWomen:Wave 1: 1:00.69Wave 2: 59.59Men:Wave 1: 54.19Wave 2: 53.37 View this post on Instagram A post shared by Delaney Schnell (@laney_schnell)200m ButterflyWomen:Wave 1: 2:14.59Wave 2: 2:12.56Men:Wave 1: 2:01.19Wave 2: 1:59.63200m Individual medley Women:Wave 1: 2:17.39Wave 2: 2:15.26Men:Wave 1: 2:04.09Wave 2: 2:03.02400m Individual medley Women:Wave 1: 4:51.79Wave 2: 4:47.72Men:Wave 1: 4:25.00Wave 2: 4:23.24Live-streaming Details of US Olympic Swimming Trials 2021Both Wave 1 and Wave 2 of the US Olympic Swimming Trials will be aired live on NBC Sport. The event will also be live-streamed on NBC Stream Olympic Channel.