One day up, one day down from the World U20 Championships in Lima, Peru. 

For the U.S. contingent, it included a bit of a miscue to start when the Americans -- the reigning U20 winners -- did not field a mixed relay team due to a clerical error -- USATF released a statement saying team members were not entered into the World U20 system correctly. 

That left the U.S. off the medal stand for the 4x400, and ultimately, over the first day of action, too, with no Americans medaling. 

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But Day 2 offers some solace. Four more finals are on the calendar, including the women's discus, the women's long jump and the men's and women's 100m. The women's heptathlon will also conclude on the final day. 

Stay tuned for updates across the morning and evening sessions from the Videna Athletic Stadium in Peru. 

Women's U20 400m Hurdles

There were six heats in the opening round here, and American Jasmine Robinson found herself competing for a qualifying spot in the opening round after finishing second in 58.25 in the first heat to South Africa's Tumi Ramokgopa. 

Michelle Smith, the Montverde Academy graduate and Virgin Islands U20 athlete, won the second section in 57.85, while American Braelyn Baker was second in the third frame in 59.31.

Smith, a Georgia recruit, ran the fastest time of the heats. 

Men's U20 400m Hurdles

Arizona native Vance Nilsson, the high school national record-holder for the 300 meter hurdles, cruised to a win in the fourth section in 51.98 seconds. 

Fellow U.S. hurdler Premier Wynn joined him in the semifinals after clocking a time of 51.89 to push through to the next round. 

Finnish athlete Antti Sainio produced the top time over the heats in 51.19.

Women's U20 400m Heats

Zaya Akins and Michaela Mouton made light work of the first round on Wednesday, hitting qualifying times of 52.69 and 53.29 in frames four and six to push through to the next round. 

Akins just finished her freshman season at South Carolina, while Mouton reached the NCAA Outdoor Championships as a freshman for Houston working under famed coach Carl Lewis. 

Nigerian Ella Onojuvwevwo led all athletes through the round with a time of 52.19 seconds.

Men's U20 400m Heats

The top Americans led their heats on Wednesday. 

Atlanta Westlake rising senior Sidi Njie ran 46.83 over the first round to move on to the semifinals, while Jayden Davis followed a round later in 46.32 to move on. 

Davis, a freshman at Arizona State, ran the fastest over the first round of any athlete. 

EVENING SESSION

Women's U20 Discus

It was a pair of Chinese women who finished 1-2 in the discus. Bingyang Han took the top spot with a personal best mark of 57.57 meters, while Jingru Huang was second in 56.47m. 

Australia's Marley Raikiwasa followed in 56.25. 

Two Americans finished the final inside the top nine spots, including fifth-place Gracelyn Leiseth, who threw a mark of 52.87m, and Reese Garland, who was ninth in 50.56m. 

Women's Heptathlon Final

Through seven events, Croatia's Jana Koščak dominated across the competition, accruing a winning total of 5,807 points to take the tape and finishing her final 800m in a time of 2:24.56. She outpaced second-place Lucia Acklin of Switzerland by 52 points, while American Abby Elmore was 13th in 5,052. 

Women's U20 100m Final

Jamaica's next-in-line showcased her talent on a global stage amid a field of up-and-coming talents from across the world. 

Alana Reid, a professional with Nike, won with a time of 11.17, staving off a strong start from British Virgin Islands' Adaejah Hodge, who followed in 11.27. 

Reid, 19, is considered one of Jamaica's brightest young talents and featured at the Olympics, contributing to the women's fifth-place finish in the 4x100. A Pan American U20 and NACAC U18 champion, she padded her resume on Wednesday, clocking the fourth-fastest time of her season -- she had run 11.09 in April. 

Hodge, an Olympian for BVB reaching the 200m semifinals, had the fastest reaction time of the field in 0.133.

Barbados' Kishawna Niles was third in 11.37. 

No American athlete reached the final. 

Men's U20 100m Final

South Africa's Bayanda Walaza was the man in charge in the final, clocking a winning time of 10.19 seconds. 

He was the only athlete under 10.20 in the final, followed by Thailand's Puripol Boonson in 10.22 seconds. Walaza's teammate, Bradley Nkoana, was third in 10.26. 

No American was in the final.

Women's U20 Long Jump Final

The Americans earned their first medal in the pit, and it came by virtue of an Illinois freshman. 

Oregon native Sophia Beckmon pocketed a silver medal with her performance of 6.54 meters on Wednesday, coming up just four centimeters short of the winning mark of 6.58m by Australia's Delta Amidzovski. 

Poland's Julia Adamczyk was third in 6.34m. 

Men's 400m Semifinals

The American men will have a significant opportunity to bag multiple medals in the final. 

Arizona State freshman Jayden Davis and Atlanta Westlake High School junior Sidi Njie both secured wins in their semifinal heats on Wednesday, clocking times of 45.79 and 46.56 to push through to the championship round. 

Njie commented afterward that he was saving his best for Thursday's final in Lima, while Davis said he employ the same gameplan that navigated him through the rounds. 

Davis looks to be in control after hitting top times across both rounds. He was the only athlete to drop under 46 seconds in the semifinal.

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