#3 Alexa Bliss
Alexa Bliss lost the Raw women's title to Nia at WrestleMania, and this was supposed to be a rematch at Backlash 2018. The bout which lasted around 10-15 minutes was ultimately won by Nia.
But soon afterwards, reports emerged that Alexa Bliss had injured her shoulder during the match. There were no clear signs or any moment which could be pinpointed as the time when Bliss' shoulder was injured, but according to reports, it happened during the match with Nia.
Because of the shoulder injury, Bliss who was one of the more formidable heels on Monday Night Raw was put out of action, and she didn't feature on Raw for many weeks after that incident.
This was one of the earlier signs when backstage heat first started gathering momentum against Nia Jax.