Today's the day! The 2019 USATF Outdoor Championships are finally upon us, and for the second year in a row, they're going down in Des Moines, Iowa. 

In just four days, we'll know which athletes will represent the United States in Doha, Qatar, for the IAAF World Championships in October. The men's discus, women's javelin, women's triple jump, and the men's and women's 10,000m teams will be decided in finals today, and rounds action will begin with the women's 100m.

Refresh this page often for live updates from the blue oval. All times below are listed in Central.

WATCH: Post-race interviews from the mixed zone

4:40 p.m. | Women's 100m, Round 1 of 3

Top 3 + next 4 fastest to 2 semis; Top 4 each semi to final

A slight headwind today on the straightaway, but temperatures hovering around 80 degrees will provide decent conditions. Notably, the reigning world champion, Tori Bowie, will sit out this event as she already secured a bye to the world championships via her 2017 global title.

In the first heat, Teahna Daniels took advantage of Sha'Carri Richardson's inefficient start to win in 11.30 over runner-up Richardson's 11.41. Richardson's start initially earned her the lead, but didn't allow her to build much speed because she popped upright from the blocks almost immediately. LSU's Kortnei Johnson nabbed the third spot in 11.48 over former Arkansas standout Kiara Parker.

In heat two, Morolake Akinosun ran down Kayla White with a furious close in 11.35 for first. White ran 11.40, and was tailed closely by USC's Twanisha Terry in third (11.41). 

Jenna Prandini, who committed early to her start, won heat three in 11.41, followed by Ashley Henderson in 11.46 and Mikiah Brisco in 11.49. 

In the fourth and final heat, Dezerea Bryant walked away with the best result of the day in 11.25 over No. 2 on the day English Gardner, who ran 11.28. Defending U.S. champion Aleia Hobbs earned the third spot in 11.41.

Some standouts who did not advance include Jasmine Todd, who ran 11.65, and Deajah Stevens, who did not show.

Round 1 Results:

We caught up with English Gardner after the first round:

5:05 p.m. | Men's 100m, Round 1 of 3

Top 3 + next 4 fastest to 2 semis; Top 4 each semi to final

The slight headwind gained strength ahead of this event, which will prevent us from seeing any crazy-fast times today. World No. 2 and last year's U.S. champion, Noah Lyles, must not have thought his runner-up performance in Monaco gave him the evidence he needed to double in the 100m and 200m because he didn't appear on the entry list. 

Mr. Consistent, Mike Rodgers, claimed heat one in 10.24 by a hundredth of a second over Christopher Belcher. This year's NCAA runner-up, Cravon Gillespie, took third in 10.29. 

Heat two got off to an odd start as Kyree King fell out of his set position during a long gun hold, which caused the field to get called back. King was disqualified for the false start. In heat two, take two, Nike athletes Isiah Young and Justin Gatlin had some fun with a friendly exchange of gestures right before finishing No. 1 and 2, in that order (10.14 to 10.16). Ameer Webb grabbed the third spot in 10.29.

After not racing all season as he recovered from injury, all eyes were on 2018's second-fastest man, Ronnie Baker, in heat three, and he did not disappoint, taking the win with ease in 10.26 over Kendal Williams (10.37) and Kenzo Cotton (10.41). Cameron Burrell, despite getting out strong, fell just outside an automatic qualifying spot to fourth (10.43).

World leader Christian Coleman headlined heat four and lived up to his billing by getting out hard and shutting down the effort nearly 20 meters before the line for the win in 10.29. The final two automatic spots went to Remontay McClain (10.35) and Jaylen Bacon (10.40).

Burrell was the first man on the outside looking in—he will not advance to the semifinal.

1-2 finish in heat two ?? pic.twitter.com/LKqKnaX9yb

— FloTrack (@FloTrack) July 25, 2019

Round 1 Results:

5:30 p.m. | Women's 1500m, Round 1 of 2

Top 3 each heat + next 3 fastest to final

A touching dedication to the late Gabe Grunewald, who inspired so many as she refused to allow cancer to stop her from pursuing her dreams and living her life fully, introduced the women's 1500m with flowers lain on the track. 

From the gun, it was clear that this was going to be a kicker's race as the field took it out at 4:10 pace, which made it seem like it would play into Dani Jones' hands, though she couldn't find the right gear on the homestretch and finished fifth in 4:12—she'll have to hope that gets her in on time. Kate Grace, who untucked from the back with less than two laps to go, closed hard after a 66-second penultimate lap and won in 4:10.23, followed by this year's NCAA champion, Sinclaire Johnson of Oklahoma State. Brooks Beast Katie Mackey earned third in 4:10.98.

Heat two, featuring Jenny Simpson, got off to an almost comically slow start as they clipped off the first 300m in 57, which is slower than how Jenny typically approaches the 5000m. Things started heating up with about 600m to go with Simpson in the lead, followed by Shannon Osika and Helen Schlachtenhaufen. Bowerman Track Club athlete Elise Cranny made a big move with 200m to go and pushed past Simpson and Osika down the homestretch. Shockingly, Cory McGee got aggressive on the inside and pushed Osika out of the way—it definitely looked like illegal contact (expect an appeal)—as she charged into third behind Simpson. 1, Cranny: 4:19.99; 2, Simpson: 4:20.12; 3, McGee: 4:20.17; 4, Osika: 4:20.93.

UPDATE: McGee was disqualified for impeding Osika.

Defending champion and Iowa native Shelby Houlihan garnered plenty of cheers from the crowd as she waved from the line in heat three. Nikki Hiltz, who has won nearly every race she's started this season, bolted immediately to the lead from the gun, but Jessica Harris, newly clad in Nike, assumed the lead as she tends to heading into the second lap. New Brooks Beast Karisa Nelson and Eleanor Fulton slotted in behind her after the field peeled off 67-/68-second laps. Houlihan and Hiltz stayed close to each other heading into the third lap, where they moved up to get into solid closing position with 400 meters to go. Off the final curve, Nelson struck hard and finished in 4:07.66, but was taken at the line by Houlihan (4:07.35) and Hiltz (4:07.40), in that order. 

I will be surprised if we don't see a protest from Shannon Osika in heat two of the women's 1500m prelims. Cory McGee made contact as she passed on the inside, and Osika stumbled a bit and finished fourth, out of qualifying.

— Fast Women (@fast_women) July 25, 2019

Round 1 Results:

5:57 p.m. | Men's 400m Hurdles, Round 1 of 2

Top 3 each heat +next 4 fastest to 2 semis; Top 4 each semi to final

In heat one, TJ Holmes ran away with it in 49.87, followed by former Illinois standout David Kendziera in 50.04 and the unattached William Wynne, who used to compete for Florida, in 50.57.

Former Washington State Cougar Craig Allen, running unattached for the win in 49.33, downed new pro and former Speed City product Amere Lattin (49.99) and NCAA runner-up Norman Grimes of Texas Tech (50.20), who struggled with his step count and certainly has room for improvement in the semifinal.

UPDATE: Allen was disqualified for a trail leg infraction (it went around the hurdle instead of over the top)

The top attraction in this event and one of the brightest up-and-coming talents on the global stage, Rai Benjamin, qualified comfortably in 49.61 over Byron Robinson, 50.44, and Quincy Downing, 50.56. 

The fourth and final heat featured some classic 400m hurdlers in reigning Olympic champion Kerron Clement, who won in 49.79, and Johnny Dutch, who finished fourth in 50.08. Second went to Khallifah Rosser, 49.90, and third to Arkansas' Nicholas Hilson, 50.03.

Round 1 Results:

6:22 p.m. | Women's 800m, Round 1 of 3

Top 3 each heat + next 4 fastest to 2 semis; Top 3 each semi + next 2 fastest to final

Unsurprisingly, Ajee Wilson claimed heat one with ease in 2:04.69 ahead of two surprising qualifiers, B.A.A.'s Brenna Detra (2:05.05) and the unattached Michelle Howell (2:05.12). The two beat out Division II stud Skylyn Webb (2:05.20), former Division III standout-turned-HOKA pro Emily Richards (2:05.83), and 2016 Olympian Chrishuna Williams (2:06.06). 

Oregon Track Club's Hanna Green claimed victory in heat two with a time of 2:02.74, followed by Penn's Nia Akins in 2:03.34 and Sadi Henderson (2:04.00). Meghan Manley made it through on time (2:04.06).

In heat three, Ce'Aira Brown led the pack in 2:03.52 and Sammy Watson of adidas finished runner-up in 2:03.69 ahead of Kenyetta Iyevbele in 2:03.80. Virginia Tech's Rachel Pocratsky will make it in on time after finishing fourth in 2:03.99.

Raevyn Rogers, not wanting to leave anything to chance, blasted the fastest time of the day in 2:01.77 with the precocious Athing Mu in tow for a 2:01.95 effort. Olivia Baker got the third automatic spot in 2:02.55, while the final two time qualifiers also made it out of this heat: Savannah Camacho-Colon, 2:02.75; Rebecca Mehra, 2:02.85.

Notably, Kaela Edwards faded hard during her heat three effort (2:07.67) and will not advance.

Round 1 Results:

6:47 p.m. | Men's 800m, Round 1 of 3

Top 3 each heat + next 4 fastest to 2 semis; Top 3 each semi + next 2 fastest to final

In just his fourth race of the year, Nike's Isaiah Harris stormed to victory and the top time of the evening in 1:46.87. He hasn't cracked 1:46 this season, but if he wants to make the world team, he'll need to. Harris pulled Robert Downs (1:47.03) and Erik Sowinski (1:47.03) along to automatic-qualifying marks, and three more via time-qualifying.

Donavan Brazier turned in the third-fastest time overall in heat two with a 1:47.66, though the next two automatics didn't have the steam to hang with him: Quamel Prince (1:48.21) and Isaiah Jewett (1:48.46).

Brazier's Nike Oregon Project teammate, Clayton Murphy, also won his heat in 1:46.89. The Oregon Track Club member by way of Virginia Tech, Drew Piazza, took second in 1:47.44. B.A.A.'s Sam Ellison took the third big Q in 1:47.49, while Dejon Devroe earned a little q in 1:47.72.

In the fourth heat, the indomitable Bryce Hoppel extended his win streak to 21 as he delivered a 1:47.65 over a close challenge from Brannon Kidder (1:47.68). Harun Abda closed for third in 1:48.35.

Round 1 Results:

7:12 p.m. | Women's 400m, Round 1 of 3

Top 3 each heat + next 4 fastest to 2 semis; Top 4 each semi to final

In her first race in nearly a year, new mother Allyson Felix qualified on time with a fourth-place, 52.20-second finish in heat one against the likes of Lynna Irby, who won in 51.14; prep short sprinter-turned-400m pro Kaylin Whitney, who finished runner-up in a PR of 52.02; and young NCAA standouts Briyahna DesRosiers of Oregon and Brionna Thomas, formerly of Purdue. 

Shakima Whimbley recorded the fastest time of the night in 50.87, a season's best, followed by Courtney Okolo, who ran 51.10. All the expected qualifiers made it through without drama.

Round 1 Results:

7:37 p.m. | Men's 400m, Round 1 of 3

Top 3 each heat + next 4 fastest to 2 semis; Top 4 each semi to final

Heat one was an H-Town Speed City party as Obi Igbokwe (unattached) won in 45.18 and Kahmari Montgomery (NIKE) eased into third in 45.74. Tyrell Richard, formerly of South Carolina State and now representing adidas, finished second in 45.55.

Trevor Stewart of North Carolina A&T won heat two in 44.76, followed by the blade runner, Blake Leeper, in 45.09, and then former Baylor product Wil London in 45.47. 

Michael Norman turned in the only other sub-45 in the pouring rain as the foreboding clouds unleashed on heat four, drenching the track ahead of the steeplechase. Mar'yea Harris was DQ'd from heat four due to what appeared to be a lane infraction.

Round 1 Results:

8:21 p.m. | Men's 3000m Steeplechase, Round 1 of 2

Top 5 each heat + next 4 fastest to final

This one largely went to form as Stanley Kenebei cruised through the first round in 8:32.06 with Andy Bayer following in 8:32.55 and then Mason Ferlic in 8:33.67. Last year's mixed zone darling, Jordan Mann, made it through on time in 8:34.79.

8:50 p.m. | Women's 10,000m, Final

With just three women entered that obtained the IAAF standard earlier in the season, many speculated that the race would go out at the pace necessary to hit that mark. Despite Stephanie Bruce's efforts to pull the field along to a faster time early, many were resistant, which required the runners to dial up the pace later to make up for lost ground. 

Around the halfway mark (16 minutes at 4800m), Emily Sisson decisively surged to the front, peeling Molly Huddle, Marielle Hall, Kellyn Taylor, and Bruce away from the pack. Through 6400m, Sisson took them through in 21 minutes with Hall directly behind her and Huddle sitting on her hip.

With a mile to go, Huddle reeled Sisson in slightly and moved to her shoulder. Sisson probably knew she needed to start turning the screws in order to lose her, and began to ratchet down. 

Of course, that didn't deter Huddle, who matched her speed. With three laps to go, Huddle got on her toes and took the lead.

With just over 400m meters to go, Taylor stuck her nose into the Sisson-Huddle pack, but that's when Huddle dropped the hammer and gapped Taylor and Sisson by five meters.

Taylor responded by passing Sisson and held it into the bell lap! Huddle opened up a 100-meter chasm between herself and Taylor, and from there, the battle was all Taylor and Sisson. 

Sisson overcame Taylor down the homestretch, 32:02.19 to 32:02.74, and Huddle took the win in 31:58.57 with a 66.80 final lap.

9:29 p.m. | Men's 10,000m, Final

With a downright jubilant 55.5 final lap, Lopez Lomong won his fourth U.S. title and second consecutive 10,000m title in his fourth race ever at the distance with a PR and a facility record at Drake Stadium in 27:30.06. 

What might be even more incredible is that he said he's planning on running the 1500m preliminary round tomorrow. 

After flying away from the rest of the field near the halfway point with a 62-second lap at 4400m, Lomong rode Shadrack Kipchirchir's coattails all the way until the last lap, when he totally buried his opponent, who only managed to close in 1:12 after spending all of his energy trying to drain Lomong. 

His PR improved on his former best 10,000m mark by nearly 50 seconds. Unreal.

2️⃣7️⃣:3️⃣0️⃣.0️⃣6️⃣ facility RECORD for Lopez Lomong?? pic.twitter.com/dCyJpHn5Jh

— FloTrack (@FloTrack) July 26, 2019

Men's Discus

After a solid European circuit, Reggie Jagers failed to finish in the top eight and will not make the world team headed to Doha. Velaasa's Sam Mattis came up big with a season's best of 66.69m/218-9 to top the podium, which was rounded out by Brian Williams (65.76m/215-9) and Kord Ferguson (63.23m/207-6).

Women's Javelin

Ariana Ince of Velaasa took the top spot with a 61.06m/200-4 throw, followed by national stalwart Kara Winger, 59.73m/195-11, and then NCAA fourth-placer Jenna Gray of Stanford in 57.29m/187-11.

Women's Triple Jump

Keturah Orji won her fourth-consecutive U.S. title with her very first jump, 14.56m/47-9.25. Her U.S. rival, Tori Franklin, finished runner-up with a 14.36m/47-1.5 leap.

LAUNCHING...

[■■■■■■■■■■] 100%#ToyotaUSATFOutdoors | @Keturahorji pic.twitter.com/hiNH9gk6NN

— Team USA (@TeamUSA) July 26, 2019