SI Insider: Main Takeaways So Far From The U.S. Open Semifinals

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The women's semifinals results are official while the men's semifinals are set to take place tonight.

SI Senior Writer Jon Wertheim breaks down Naomi Osaka's win and Serena Williams's surprising loss as the women's tournament heads into the finals. 

Wertheim also goes into detail on what could be a once in a lifetime opportunity for the remaining participants of the men's tournament, as this will be the first time in 4 years that someone other than Novak Djokovic, Rafael Nadal, or Roger Federer will win.