#1. WWE Superstar Reckoning - Royal Rumble 2021

The Women's Royal Rumble match back in January was won by The EST of WWE, Bianca Beliar. But the match itself was forced to go through several changes in the build-up to the show.
WWE Superstar Mia Yim, who is now known as Reckoning on the main roster, took to Twitter to reveal that she had tested positive for COVID-19. The former NXT Superstar was originally part of The Royal Rumble match, since she had been promoted to the main roster a few months earlier.
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This meant WWE was then given the headache of having to replace the Superstar just days before the event. In the end, it was former NXT UK Women's Champion Toni Storm who was given the chance to be part of the match in place of Reckoning.
There were also several last-minute replacements in the men's Royal Rumble match, since Jey Uso was struggling with an injury at the time. Despite declaring himself for the match, he wasn't part of the 30-man field.