 One of the featured matches was contested for the WWE United States Championship , in which Booker T defended the title against John Cena . At SummerSlam , Cena defeated Booker in the first series of " best of five " match . On the August 26 episode of SmackDown ! , the second match was won by Booker , to even the series one @-@ to @-@ one . The following night at a SmackDown ! live event , Booker defeated Cena to win the third match . On the September 16 episode of SmackDown ! , Cena defeated Booker in the fourth match , making the series even at two wins apiece . The following week it was announced that the final series title match would be scheduled at No Mercy . 
