10 WWE Superstars who are one title away from becoming a Grand Slam Champion

#8 Rey Mysterio

Mysterio is expected to return to the WWE post WrestleMania 34

Mysterio made his shocking return to the WWE in the Royal Rumble match in January, but unfortunately, it was only a one-off appearance, as he had not signed a full-time contract with the WWE during the period.

However, it is being expected that the Master of the 619 will be back inside a WWE ring again after WrestleMania 34, as it is not a matter of 'if' but a matter of 'when' he will make his highly anticipated full-time return to the WWE.

Mysterio has won multiple Championships in the WWE and, has had a Hall of Fame-worthy career. The one thing he is yet to accomplish is becoming a Grand Slam Champion in the WWE.

Rey Mysterio's Championship stats in the WWE:

Championships Won:

1) World Heavyweight Championship (2 times)

2) WWE Championship (1 time)

3) WWE Cruiserweight Championship (3 times)

4) WWE Intercontinental Championship (2 times)

5) WWE Tag Team Championship (4 times)

Championship required for a Grand Slam:

1) The United States Championship

Rey Mysterio needs to win the United States Championship when he makes his return to the WWE, to take his place among the WWE Grand Slam Champions.