WWE Money in the Bank 2019: 5 records that could be made 

#2 Rey Mysterio could become the 21st Grand Slam Champion

Rey Mysterio could finally lift the United States Championship on Sunday night

Rey Mysterio has had an illustrious WWE career over the years that has seen him rise to the top of the mountain and become World Champion on more than one occasion. Mysterio returned to WWE last year and has been looking to pick up his first piece of gold since his return, a piece of gold that could come this weekend when he faces Samoa Joe.

Mysterio was easily defeated by The Samoan Submission Machine last month at WrestleMania but if he's able to overcome the odds this weekend at Money in the Bank then he will finally have captured the United States Championship and become the 21st Grand Slam Champion in WWE history.

Rey Mysterio became the company's 21st Triple Crown Champion a few years ago, but the United States Championship has always been the one that has alluded him.