#1 Andrade
Andrade is not a surprising entrant here, and he had a spectacular rivalry with Johnny Gargano in NXT. Though Andrade doesn't have an opponent at SummerSlam, he could begin a new rivalry after the show in Toronto. Earlier, Andrade competed in a Gauntlet Match to become the number one contender for AJ Styles, but the match was won by Ricochet.
Similar to Johnny Gargano, Andrade was a big name in NXT. However, he couldn't replicate the same success on the main roster. The former NXT Champion made his main roster debut last year but he has failed to reach the top of the ladder.
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Despite his substandard booking, Andrade has delivered some remarkable matches on the main roster. When Andrade was the NXT Champion last year, he fought Gargano at NXT Takeover: Philadelphia. It was one of the greatest matches in the history of the developmental brand and the match won NXT Match of the Year Award in 2018.
Considering the track record of the two men, we could see more classic matches on the main roster if Andrade starts a new feud with Gargano.