During Payback (2016) which current United States Champion wrestler was defeated by Roman Reigns?
Payback (2016):  In the main event, Roman Reigns defeated AJ Styles to retain the WWE World Heavyweight Championship. A.J. Styles: Allen Neal Jones (born June 2, 1977), best known by the ring name AJ Styles (also stylized as A.J. Styles), is an American professional wrestler who is signed to WWE performing on the SmackDown brand, where he is the current United States Champion in his second reign.
A.J. Styles