#2 Ronda Rousey vs Becky Lynch

While this rivalry did conclude in the main event of WrestleMania, fans were not satisfied when it ended. Ronda Rousey and Becky Lynch had the fiercest and most personal rivalry in WWE at the time, without actually having any one-on-one matches with each other.
The two cut some fiery promos on each other and were set to clash at Survivor Series until The Man broke her nose courtesy of a Nia Jax punch. She ended up winning the Royal Rumble and challenged Rousey to a match at WrestleMania 35 before Charlotte Flair got added to the mix.
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But even in a triple threat scenario with both women's belts on the line, the payoff between Rousey and Lynch would be worth it. Unfortunately, the main event did not deliver as WWE would have liked. It happened past midnight at MetLife Stadium, with the entire WWE Universe exhausted after seven hours of action.
The worst part was that Rousey's shoulder was off the mat when Lynch pinned her to win the RAW and SmackDown Women's Titles. It was a great moment ruined by that botched finish, a real shame considering the personal nature of the feud between the two.
With Ronda Rousey yet to return to WWE since that match and Becky Lynch going on maternity leave, the chances of a proper blowoff match between the two are unlikely, if it ever happens.