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With an average of 26.8 years, this is the youngest Olympic roster the USWNT has had since the 2008 gold-medal winning team.

"There's been a lack of development of putting players, some of the less experienced players, in a position where they can develop that experience. We have to do that to take that next step," Hayes said.

"There's such a big gap between the top experience and the rest. We really have to bring that up," Hayes added. "The last eight months has been about giving experiences to bridge that gap because there is a correlation between caps and success at international tournaments."