WWE.com wrote an article about the main event then deleted it.
It stated that Shinsuke Nakamura won due to Baron Corbin interferring and mistakenly laying out John Cena.
It makes sense that was the original finish, Baron tries to attack Shinsuke, lays out Cena, Nak gets the win.... Cena vs. Corbin at SummerSlam. Obviously Cena changed it to Shinsuke going over clean then having Baron come out after the show to attack them and set up the Summerslam match.
It stated that Shinsuke Nakamura won due to Baron Corbin interferring and mistakenly laying out John Cena.
It makes sense that was the original finish, Baron tries to attack Shinsuke, lays out Cena, Nak gets the win.... Cena vs. Corbin at SummerSlam. Obviously Cena changed it to Shinsuke going over clean then having Baron come out after the show to attack them and set up the Summerslam match.