Tia Jones is giving it another go for gold. So are former IAAF age-group champions Tara Davis and Sammy Watson.
Jones won the 100m hurdles in 12.89 on Saturday (16) night on day 2 of the USA Junior Championships at Bloomington, Indiana.&nbsp;
Cortney Jones was second in 12.91, knocking U20 record-holder Chanel Brissett off Team USA. Brissett, third in 12.95, set a pending record of 12.75 a month ago. Davis was fifth in 13.12.
Jones, at age 15, was bronze medalist in the IAAF World U20 Championships Bydgoszcz 2016. Her PB that year was 12.84.
Top two in each event qualify for selection to next month&rsquo;s junior worlds at Tampere, Finland.
Davis missed making it in the hurdles but set a world junior lead of 6.71m in the long jump to make the team in that event. She won long jump gold in the 2015 World Youth Championships in Cali, Colombia.
&nbsp;
<div id="5b261d35da8b9102b8e8e622" class="dropMedia">
<div style="background-image: url('https://media.aws.iaaf.org/media/Small/2c9ae430-0ce9-4964-a7aa-a1c89b2a5191.jpg');">&nbsp;</div>
Sammy Watson winning the US junior 800m title</div>
&nbsp;
Watson will try to repeat her gold from Bydgoszcz, after taking the 800m in a season best of 2:01.46. Caitlin Collier was second in 2:01.66.
Watson ran relatively even splits of 59.69/1:01.77. That came one week after winning an NCAA title in Eugene with 61.08/63.13 for 2:04.21.
&ldquo;I feel like I have been in every kind of race,&rdquo; she said.
The high jump champion was Shelby Tyler, whose victory came three weeks after a school shooting in her hometown of Noblesville, Indiana. She was barricaded for hours in her high school English class. Science teacher Jason Seaman, protecting his students, was injured in the shooting at a nearby middle school.
&ldquo;It was terrifying, honestly,&rdquo; Tyler said. &ldquo;It was an awful experience, but definitely one that brought the whole community together.&rdquo;
Tyler, coming off a 9 February surgery to repair a torn meniscus in her left knee, jumped a PB of 1.85m on her first attempt. She was first on countback over Sanaa Barnes, whose 1.85m was also a PB.
In men&rsquo;s events, Cory Poole became the third in meet history to sweep the hurdles. One day after winning the 110m barriers in 13.34, he took the 400m hurdles in 49.71. "I never thought I would be doubling,&rdquo; he said, but completed the sweep after waiting out a 90-minute delay because of a storm warning.
&ldquo;I kept saying to myself, &lsquo;Be strong mentally, be strong mentally,&rsquo;&ldquo; Poole said.
Previous hurdles sweeps were achieved by Kenneth Ferguson in 2003 and Jeffrey Jackson in 1993.
Adrian Piperi won the shot put at 21.50m, moving up to No. 2 among U20 athletes this year. Jordan West was second at 21.16m, worth No. 4 on the yearly list.
Josh Hoey came off a slow 55.28 opening lap to take the 800m in 1:49.48, a second off his 1:48.37 PB.
Roy Jordan for the IAAF

Tia Jones is giving it another go for gold. So are former IAAF age-group champions Tara Davis and Sammy Watson.

Wins by Jones, Davis and Watson highlight day 2 at US Junior Championships

Tia Jones finished second at the US Junior Championships last month but the 15-year-old, who has already clocked 12.84 in the 100m hurdles and still has three full seasons left in the junior ranks, was the fastest qualifier across the six heats, the key highlight as the fourth day of competition at the IAAF World U20 Championships Bydgoszcz 2016 got underway on Friday (22).
Jones clocked 13.04 to lead the round ahead of teammate and domestic champion Alexis Duncan (13.11) and European junior champion Elvira Herman (13.13) from Belarus.
Despite being ranked fourth on the world all-time U20 lists, Jones isn&rsquo;t the fastest entrant in Bydgoszcz. That accolade belongs to the US-based Nigerian Tobi Amusan, who finished second at the NCAA Championships last month.
Amusan was another heat winner this morning, easing across the finish line in 13.26 to win by more than four tenths. With two of the four fastest U20 athletes of all-time in the field - and the conditions set to remain favourable - the championship record of 12.89 looks due for revision this week.
Another noteworthy qualifier was Katerina Dvorakova - the daughter of former world decathlon record-holder Tomas Dvorak- but world youth champion Maribel Caicedo was disqualified after crossing the finish line in a qualifying spot.
The qualifying conditions in the women&rsquo;s 200m were relatively soft with the top four from each heat automatically moving on to the semifinals but Bahrain&rsquo;s Edidiong Ofonime Odiong took advantage of a warm morning - and a 1.9 m/s tailwind - to lead the heats with 23.06 ahead of Sada Williams from Barbados, who eased through with 23.38.
Williams leads the world U20 season&rsquo;s lists with 22.61 and will be looking to become the first athlete from her country - male or female - to win a track medal at these championships.
<h3>Favourites qualify in the middle distances</h3>
All of the principal contenders comfortably qualified for the men&rsquo;s 800m semifinals. Heat winners included world youth champion Willy Tarbei (1:48.95), Kenyan junior champion Kipyegon Bett (1:50.82), world indoor finalist Mostafa Smaili (1:49.82) from Morocco and Riadh Chninni from Tunisia, who was the fastest across the five heats with 1:48.40.
The qualifying conditions were decidedly tougher in the women&rsquo;s 1500m although the qualifying prospects of the athletes in the first heat were raised considerably with 3000m bronze medallist Konstanze Klosterhalfen from Germany - a 4:06.91 performer - a late scratch.
With a 62-second last lap, Ethiopia&rsquo;s Adanech Anbesa won the first heat in 4:15.53 ahead of Kenya&rsquo;s Joyline Cherotich (4:16.41) and Rwanda&rsquo;s Beatha Nishimwe (4:17.85) while Winfred Mbithe won the second heat in 4:12.39 ahead of United States&rsquo; Alexa Efraimson (4:13.12) and Ethiopia&rsquo;s Fantu Worku (4:13.84).
<h3>Chopra shows form to lead javelin qualifying</h3>
Neeraj Chopra has been in indifferent form since setting an Asian U20 javelin record of 82.23m in February but the Indian led the two qualifying pools with 78.20m ahead of Grenada&rsquo;s Anderson Peters (76.20m) and Hungary&rsquo;s Mark Xaver Schmolcz (74.80m).
Not only is the final shaping up to be one of the highest quality of the championships with 14 athletes surpassing the automatic qualifying mark of 72.50m, the event is perhaps the most diverse on the programme with throwers from 13 countries making it through to the final.
Some of the top-ranked women&rsquo;s triple jumpers struggled to reach the automatic qualifying distance of 13.20m but China&rsquo;s Ting Chen led the two pools with a 13.77m lifetime best.
World U20 leader Davisleidis Velazco (13.14m) of Cuba and world youth champion Georgiana-Iuliana Anitei (13.10m) of Romania also qualified.
With just four jumpers eliminated, qualifying was a formality for the leading women&rsquo;s high jumpers. All of the top names made it through, including world youth champion Michaela Hruba and Yuliya Levchenko from Ukraine, who leads the entry-lists with 1.95m.
Cuban Adriana Rodriguez produced a season&rsquo;s best of 5.96m in the long jump to maintain her lead in the heptathlon with 4528 points ahead of Austria&rsquo;s Sarah Lagger (4344) and Belgium&rsquo;s Hanne Maudens (4325) who produced a standout 6.34m in the fifth event to move from eighth to third. &nbsp;
Steven Mills for the IAAF

Jones impresses in 100m hurdles heats as Day 4 kicks off in Bydgoszcz

Jones impresses in 100m hurdles heats as day four kicks off in Bydgoszcz

Tia Jones finished second at the US Junior Championships last month but the 15-year-old, who has already clocked 12.84 in the 100m hurdles and still has three full seasons left in the junior ranks, was the fastest qualifier across the six heats, the key highlight as the fourth day of competition at the IAAF World U20 Championships Bydgoszcz 2016 got underway on Friday (22).

A clutch of outstanding sprint performances highlighted the US Junior Championships, which concluded on Sunday (26) after three days of action in Clovis, California.
The most notable of all of the weekend's performances came in one of the preliminary rounds.
Running in the heats of the 100m hurdles, 15-year-old Tia Jones clocked a sensational 12.84 to equal* the existing world U20 record set by Cuba's Aliuska Lopez in 1987.
Tobi Amusan of Nigeria clocked 12.83 in El Paso on 30 April, but that mark won&rsquo;t be ratified as there was no post-race drugs test and a 12.74 clocking by USA's Dior Hall in 2015 was not ratified as a world U20 record for the same reason.
Jones, whose time was also a world U18 best and a world age-15 best, will be still young enough to compete at the IAAF World U18 Championships Nairobi 2017 and will still be a junior up to and including 2019.
Much of her speed carried over to the final, but there she was surprisingly nipped at the line by Alexis Duncan by a scant 0.01, 13.04 to 13.05.
It was a personal best for the 17-year-old Duncan, who will now be targeting a podium finish at the IAAF World U20 Championships Bydgoszcz 2016 to make up for a disappointing seventh place finish at last year's IAAF World U18 Championships in Cali where she started among the favourites.
Sydney McLaughlin's high powered momentum continued with her 54.54 400m hurdles victory, just outside the 54.46 world U18 best she ran on 19 June.
"I was nervous for the first one hundred, I didn&rsquo;t get out as I wanted to, but as the race went on I got back to my place and finished well," McLaughlin said. "This was a good way to get back and run another 54 and get that under my belt."
Next stop for the 16-year-old world youth champion will be the US Olympic Trials where she'll be aiming to become one of the youngest ever track and field Olympians.
Her brother Tyler will also be joining her on the team for the World U20 Championships after he won the men's 400m hurdles in 50.74.
<h3>Hill and Lyles impress in 100m</h3>
Sprinters Candace Hill and Noah Lyles produced impressive 100m performances to highlight the first day's action.
Hill, the world youth 100m and 200m champion and still just 17, blazed through the opening round in 11.09, the fastest U20 performance in the world this year, before dominating the final in 11.24. Jayla Kirkland edge Celera Barnes in a tight battle for second, each credited with 11.41.
"It wasn&rsquo;t the best race for me but I&rsquo;m pleased," said Hill, who entered the weekend with an 11.19 season's best. "It feels amazing, I came out here, this was my goal [to qualify for the IAAF World U20 Championships] and make the team in the 100."
Hill made waves last year when she clocked 10.98 at age 16 to become the youngest girl to run under 11 seconds in the event.
After winning her 200m heat in 22.76, Hill didn't start for the final. In her absence, the title went to Kirkland in 23.16.
In the men's 100m, Lyles was as dominant as Hill was, running away with the title in 10.08. His performance was assisted by a 2.2m/s tailwind, just beyond the 2.0m/s allowable for record purposes.
"It felt pretty nice, this is my first time in three weeks getting back to racing, so I&rsquo;m just trying to get race sharp and everything," said the 18-year-old from Alexandria, Virginia, a member of the winning medley relay at last year's IAAF World U18 Championships in Cali.
All-round sprint talent Michael Norman broke the championship record in the 200m. The 18-year-old won by a comfortable margin of 0.62 to win in 20.15, moving to sixth on the world U20 all-time list. Norman, who also has a 400m PB of 45.19, will now shift his focus to the US Olympic Trials.
Just three hundredths separated Will London and Kahmari Montgomery in the men&rsquo;s 400m, with London taking the title in 45.61.
Two days after finishing fifth in the 100m, world youth silver medallist Lynna Irby convincingly won the 400m in 52.51.
<h3>World U20 leads from Krah and Matthews</h3>
Marcus Krah cruised to an impressive victory in the 110m hurdles, clocking 13.25, also the fastest in the world by a U20 athlete this season and just outside the event&rsquo;s world all-time top-10 list.
"My form going over, my start, my finish, my quickness over the hurdles, just felt great,&rdquo; said Krah, who clocked his previous personal best of 13.32 five weeks ago.
In a competitive race, Amere Lattin was second in 13.32, also a career best.
Chris Nilsen topped 5.50m on his third attempt to take the pole vault title over Deakin Volz, who cleared a personal best of 5.45m.
"One of the biggest things in pole vault is to stay consistent," Nilsen said. "This is my sixth time over 18 feet (5.48m) in a meet, so I&rsquo;m happy to represent myself and stay consistent."
World youth champion Sammy Watson won a close 800m in a PB of 2:02.91 to finish just five hundredths ahead of Aaliyah Miller.
Alexa Efraimson produced a dominant display in the 1500m, the event in which she holds the North American U20 record. She won in 4:16.75 to finish more than a second ahead of her nearest rival.
In other action, Jamari Ward won the men's long jump with a 7.84m personal best and Bria Matthews won the long jump at 6.49m, the best jump by a U20 athlete in the world this season.
Fiona O'Keefe won a close women's 5000m over Anna Rohrer 15:56.84 to 15:57.92, personal bests for both, and Kate Murphy won the 3000m in 9:10.51.
On the men's side, world youth champion Adrian Piperi won the shot put with 20.18m, his first time using the junior 6kg implement in competition. Vincent Crisp won the 800m in 1:46.97 and Charles Brown Jr took the triple jump with 16.35m.
Bob Ramsak for the IAAF
*pending the usual ratification procedures

A clutch of outstanding sprint performances highlighted the US Junior Championships, which concluded on Sunday (26) after three days of action in Clovis, California.

Wins by Jones, Davis and Watson highlight day 2 at US Junior Championships

Jones impresses in 100m hurdles heats as day four kicks off in Bydgoszcz

Jones, McLaughlin, Hill and Norman impress at US Junior Championships