#1 Matt Riddle interferes and costs Goldberg the match
Goldberg's WWE return for Super ShowDown was not the only thing fans were talking about at the time. NXT Superstar Matt Riddle was making waves after revealing that Goldberg had blocked him on Twitter. Riddle then proceeded to take several shots at Goldberg, even calling him "the worst wrestler in the business".
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Riddle has also stated that he will be the one to retire Brock Lesnar. If the rumors of Lesnar retiring at WrestleMania 36 are true, and WWE wants Riddle to be the one to do it, SummerSlam would be the right place for him to make his debut, and cost Goldberg the match (giving Ziggler the biggest rub of his career). This could result in Riddle defeating Goldberg in a match at a future PPV, preferably Survivor Series. Riddle could then go on to kick off a feud with Brock Lesnar, culminating at WrestleMania.