#4 Shayna Baszler
Ronda Rousey's good pal, Shayna Baszler has followed a similar path to her more famous buddy.
Competing in UFC at the same time as Rousey, her run in the MMA powerhouse was notably less successful with two one-sided defeats to Bethe Correira and Amanda Nunes.
Baszler's time as a top-line fighter was over long before her UFC run in 2014-15 but the 38-year-old has shown a fantastic aptitude for pro-wrestling ever since she joined WWE in 2017.
Pushed as a dominant heel, Baszler quickly won the NXT Women's Championship and won the title for a second time at WWE's first ever all-female pay per view, Evolution on October 28.
With an expected promotion to the main roster on the cards in the very near future, Baszler could well be set for an on-screen feud or alliance with Rousey. That would be something to behold, that's for sure.