 Complete the following phrase:  In August, Reigns began a feud with United States Champion Rusev, provoking a title match between the two at SummerSlam. At the event on August 21, Reigns and Rusev brawled before the match began, leading to the match being declared a no contest. In a rematch at Clash of Champions in September, Reigns would defeat Rusev to win the United States Championship, and retained the title against Rusev in a Hell in a Cell match at the 