Coastal Carolina Desmond Wallace, Nike’s Aries Merritt, and Houston Cougars Issac Williams attempt their final hurdles as they race to the finish in the prelims of the men’s 110 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Coastal Carolina Desmond Wallace, Nike’s Aries Merritt, and Houston Cougars Issac Williams compete in the prelims of the men’s 110 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Athletes compete in the prelims of the men’s 110 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Oregon Duck Devon Allen takes a breath as he gets set in the starting blocks of the men’s 110 meter hurdle prelims. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

South Carolina Gamecock Dondre Echols, Oregon Duck Devon Allen, and Ryan Wilson compete during the prelims of the men’s 110 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

South Carolina Gamecock Dondre Echols, Oregon Duck Devon Allen, and Ryan Wilson compete in the prelims of the men’s 110 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Ryan Wilson and Oregon Duck Devon Allen run through the finish of the men’s 110 meter hurdle prelims. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Oregon Duck Devon Allen looks to the display board as a replay of his race in the men’s 110 meter hurdle prelims plays. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Nike’s Brianna Rollins, Oregon Duck Alaysha Johnson, and North Carolina State University Alexis Perry sprint to the finish in the semis of the women’s 100 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Oregon Duck Alaysha Johnson looks to her competitors after finishing her attempt in the semi-finals of the women’s 100 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Hurdles are prepared for competition as Hayward Field and its audience experience a downpour of rain. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Oregon Duck Sasha Wallace completes the final hurdle as she races towards the finish line in the semi-finals of the women’s 100 meter hurdles. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Coaches and spectators attempt to stay dry during the events. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Oregon Duck Sam Prakel competes in the semis of the men’s 1,500 meter run. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Runners complete the first heat of the men’s 1,500 meter semis. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Ole Miss Rebel Craig Engels wipes the rain from his face as he crosses the finish line of the men’s 1,500 meter run semis. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Oregon Duck Sam Prakel catches his breath after crossing the finish line of the men’s 1,500 meter run semis. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Runners compete in the second heat of the men’s 1,500 meter run semis. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Nike OTC Andrew Wheating looks to the display board for his time after running in the semis of the men’s 1,500 meter race. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Nike’s Justin Gatlin, Nike’s Isiah Young, and high school athlete Michael Norman race to the finish in the first heat of the men’s 200 meter dash semis. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Nike’s Justin Gatlin congratulates high school athlete Michael Norman after Norman beat Gatlin in the semis of the men’s 200 meter dash. Norman ran a 20.21 second race with Gatlin in a close second place at 20.23. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Runners compete in the second heat of the men’s 200 meter dash prelims. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Asics Jarrion Lawson and high school athlete Noah Lyles race to the finish in the second heat of the men’s 200 meter dash prelims. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Tyson Gay, Nike’s LaShawn Merritt, and Nike’s Ameer Webb race to the finish line of the men’s 200 meter dash prelims. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Tyson Gay and Nike’s LaShawn Merritt run through the finish line of the men’s 200 meter dash prelims as they look to the display board for their times. Merritt ran the fastest time in the world this year in 19.74 seconds. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Nike’s Jasmin Stowers falls as Nike’s Nia Ali, Asics Queen Harrison, and Nike’s Brianna Rollins race to the finish line of the women’s 100 meter hurdle finals. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Kristi Castlin and Nike’s Nia Ali embrace eachother after qualifying for the women’s 200 meter dash in Rio. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold

Nike’s Nia Ali, Kristi Castlin, and Nike’s Brianna Rollins pose with their American flags as they celebrate their qualifying for Rio in the women’s 200 meter dash. Day Eight of the U.S. Olympic Trials Track and Field continued on Friday at Hayward Field in Eugene, Ore. and will continue through July 10. Photo by Katie Pietzold