#1 Bill Goldberg (maybe?)

Previous Wrestlemania Resume
Wrestlemania 20 - defeated Brock Lesnar with "Stone Cold" Steve Austin as Special Guest Referee
Top WWE star punished? More details HERE
His (Probable) Finale (We Think)
Bill Goldberg traveled the WWE 2K return road taken by Kurt Angle, Sting, and The Ultimate Warrior before him; during promotional interviews for WWE 2K17, Goldberg mentioned the possibility of having another WWE match or two left in the tank, as well as a dissatisfaction with the way his only Wrestlemania contest had been received.
Fans in Madison Square Garden in 2004 had booed Goldberg and Lesnar from the moment their promotional package started; news had leaked online that both men were leaving WWE after Wrestlemania, and the first instance of "smark" crowds hijacking a match saw the WWE Universe chant for Austin and Hogan, in addition to hurling various insults at the match's competitors.
Goldberg made his return at the 2016 Survivor Series, demolishing Lesnar in a double-digit number of seconds, then had his hopes at a Royal Rumble win dashed by The Undertaker (after Goldberg disposed of The Beast Incarnate).
Goldberg took the WWE Universal Title from Kevin Owens in February of 2017, and confirmed that Brock Lesnar would have one final shot at the former Georgia Bulldog; at Wrestlemania 33, Lesnar and Goldberg destroyed each other, and the ringside area, in a clash where nearly every move was a suplex or a finisher. In the end, Lesnar captured the Universal Title, handing Bill Goldberg the first clean loss in his entire wrestling career.

It Was the End Because
Is it? Goldberg refused to rule out a return in his final RAW Talk appearance and, though he is slated for a Hall of Fame induction during Wrestlemania Weekend this year, Goldberg still looks to be in 1998 shape.