McLaughlin breaks 400 hurdles mark on historic day at trials

Sydney McLaughlin wins a semi-final in the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials Saturday, June 26, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)

Sydney McLaughlin reacts after setting a new world record in the finals of the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)

Sydney McLaughlin wins a semi-final in the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials Saturday, June 26, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)

JuVaughn Harrison competes during the finals of the men's long jump at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Charlie Riedel)

Sydney McLaughlin reacts after setting a new world record in the finals of the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)

Sydney McLaughlin reacts after setting a new world record in the finals of the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Charlie Riedel)

Sydney McLaughlin reacts after setting a new world record in the finals of the women's 400-meter hurdles at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)

Taliyah Brooks is helped off track after collapsing during the heptathlon at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. Events were suspended due to high temperatures. (AP Photo/Charlie Riedel)

Noah Lyles reacts after winning the final in the men's 200-meter run at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Charlie Riedel)

Noah Lyles reacts after winning the final in the men's 200-meter run at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Chris Carlson)

JuVaughn Harrison competes during the finals of the men's long jump at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)

Noah Lyles celebrates after winning the final in the men's 200-meter run at the U.S. Olympic Track and Field Trials Sunday, June 27, 2021, in Eugene, Ore. (AP Photo/Ashley Landis)