#1 Andrade

While the other names on this list would be interesting candidates to defeat Rey Mysterio for the United States Championship, only one man is the perfect choice to do it. Several times over 2019, Andrade has had some excellent matches against Mysterio. He even picked up some massive victories over the Lucha legend, ripping off his mask on one occasion as well. However, Andrade has not been able to gather much momentum away from his classics against Mysterio.
The former NXT Champion has all the tools in the world to succeed as a top star in WWE, with a great manager doing his speaking for him. Hopefully, the budding tension between he and Zelina Vega does not end their successful partnership and the two quickly settle their differences to step up to the next level. Andrade beating his arch-rival for the United States Championship to solidify himself and Vega as a collective force on RAW is the best direction the two can go.
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It makes all the sense in the world, especially since Mysterio and Andrade's in-ring chemistry is tried, tested, and unmatched when they are at their best. 'El Idolo' is set to become the next big Latino star in WWE and defeating Rey Mysterio to win his first main roster championship is the right way to go for a variety of reasons. Go on WWE, build a star.