#4. Bobby Lashley
Let's get the most obvious one out of the way since Bobby Lashley would undoubtedly be the biggest superstar to benefit from retaining at SummerSlam 2021. The All Mighty will be close to half a year as the WWE Champion if he walks out of the pay-per-view with the title intact.
It's been a good reign so far and it's hard to deny that Lashley hasn't been deserving of the reign that he has. While it hasn't been without its faults, he is a legitimate WWE Champion-caliber performer and he carries himself as such.
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Beating Goldberg will do wonders for Bobby Lashley's WWE career. Not only will he have accumulated his biggest WWE title defense yet, but it will be the biggest win of his career. Lashley has some high-profile wins in WWE, including a clean victory over Roman Reigns.
However, Goldberg will be the biggest victory of his career and his overall star power post-SummerSlam will increase drastically. It might even keep the door open for a future WWE title reign down the line.