#4. The Rock
The Rock has not wrestled a match more than 30 seconds since his 2013 clash against John Cena. Since he suffered an injury during that bout, the great one refused to wrestle again - at least in longer matches.
However, The Rock has been a huge favourite to return to WWE at the upcoming Royal Rumble, win it and headline Wrestlemania 35 against Brock Lesnar in a Universal Championship match. The rumours that Saudi Arabia is offering WWE tons of money to have a rematch between The Rock and Lesnar at WWE's show in the Kingdom further solidifies the possibility of The Rock's return.
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Even though the fans might have different opinions on this, WWE always has been keen on a Rock vs. Brock rematch. Thus, if The Rock's Hollywood schedule allows him to compete, we could see the great one returning to the ring very soon.