#2 Ronda Rousey vs. Trish Stratus

It was reported earlier in the week that Trish Stratus will return at the Evolution pay-per-view in October to go one-on-one with ex-WWE Raw and SmackDown Live Women's Champion Alexa Bliss, and since her retirement, she's proven that she's willing to come back for the right match.
Many do consider Trish Stratus to be the best female wrestler in WWE history, and it's quite possible that Ronda Rousey will be stealing that moniker from her by the time she's ready to retire from pro wrestling, so a match between the two should happen at some point.
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Also, aside from a select few on WWE's main roster, Trish would probably be the best opponent for Rousey in terms of putting on a quality match.
As of this writing, it does seem like the plan is to do Charlotte Flair vs. Ronda Rousey at WrestleMania 35 next year, but as we all know, plans often change in WWE, and if Trish is interested in being on the card for Mania, then she should challenge the ex-UFC star in one of the show's featured matches.