#1 Shinsuke Nakamura becomes the new WWE Champion

AJ Styles defeated Shinsuke Nakamura at WrestleMania 34 and retained the WWE Championship. After the match, Nakamura low-blowed Styles after their match and turned heel for the first time in the WWE.
Nakamura would then go on to play games with Styles and low-blow Styles over and over in the following weeks.
Nakamura vs Styles ended in a double count-out at the Greatest Royal Rumble. Styles and Nakamura brawled outside the ring and could not answer the referee's 10-count.
Styles will take on Nakamura again at Backlash and the two would look to finish things off for good. Nakamura has been doing very good as a heel and it's time for him to have a run with the WWE Championship.
Gallows and Anderson got drafted to SmackDown Live and we can expect them to get involved in the match. Gallows and Anderson could unintentionally cost Styles the title. It can be the best way to have Styles look strong even in defeat.