Kipp, who worked on the study that gave the Vaporflys their 4% name, is pleased by the new regulations as she thinks within a year or two athletes will have a level playing field. In the meantime, she says some brands need to let their athletes run in the Nike Vaporfly "or they are going to be at a disadvantage." She also talks about what it was like to realize in 2016 that Nike had a shoe that was so much better than anyone else that she and her fellow researchers nicknamed it "The Magic." And how she believes the shoes cost Kara Goucher an Olympic spot.

Korir will face Shadrack Kipchirchir, Martin Hehir, Futsum Zienasellassie and Christo Landry while the women's race also has Natosha Rogers, Sara Hall and Shalaya Kipp. *USATF release

There will be A TON of action across the globe on Saturday, from the West Coast of the US to the East Coast to Germany to Usain Bolt in Australia. There's no way you can watch the entirety of all five meets so we preview the best matchups in chronological order and suggest you enjoy the best races from the each meet a la carte, including Hellen Obiri vs. Laura Muir over 3000, Leo Manzano vs. Paul Chelimo in a mile and a Robby Andrews-led squad going for the 4x800 WR.

Coburn remains the queen of the steeple in the US but Courtney Frerichs (9:20.92) and Colleen Quigley (9:21.29) both came up big and PR'd in the most important race of their lives to punch their tickets to Rio.

Shannon Rowbury dispatched the field with ease the final 400 and now turns her attention to a medal at Worlds. Abbey D'Agostino will join her on Team USA after a strong second-place showing.

Evan Jager surprised even himself with a 3:32.97 clocking at the Portland Track Festival as Garrett Heath helped make the race. In other action, Shannon Rowbury nearly ran an 800 pb and then doubled back in the 1500 just 12 minutes later, Cam Levins got the standard in the 5000 as Chris Derrick struggled, and Andy Bayer got the standad in the steeple.

Mark Wetmore's two biggest stars will make their season debuts - Jenny Simpson (800) and Emma Coburn (1,500) - while Kara Goucher (5,000) will run her first track race since 2013 and Mary Cain will look to regain her "teen phenom" label.

A runner was dominant over the final 1.5 laps but it O'Connor, not Kipp as Boise State's Marisa Howard PBd by 15+ seconds to get 2nd.
*MB: Upset City: Leah O'Connor Crushes Kipp - 9:36.43 FTW !!!

The favorites in men's and women's 800 and women's steeple all looked great.

Is there any way Roesler or Kipp lose or will they just totally dominate? Can Lipari stay hot in the 1,500? We break it down for you.