As announced here:
EXCLUSIVE: Unfortunately, @ShinsukeN sustained an injury last night and is not medically cleared to compete. However, #USChampion @JEFFHARDYBRAND will issue a #USOpenChallenge TONIGHT on #SDLive! pic.twitter.com/1wefUTFRRM— WWE (@WWE) June 26, 2018
They don’t give any details on whatever injury Shinsuke Nakamura apparently suffered, just that he’s not medically cleared to wrestle Jeff Hardy for the United States championship as was previously planned. Instead, Hardy will issue an open challenge for his title.
Follow along with this week’s episode of SmackDown right here.