Answer: Their first PPV main event was at WrestleMania.
WrestleMania 2 - Hulk Hogan vs
King Kong Bundy
WrestleMania III - Hulk Hogan vs
Andre the Giant
WrestleMania IV - Randy Savage vs
Ted DiBiase
WrestleMania VII -
Sgt. Slaughter vs Hulk Hogan
WrestleMania VIII -
Ric Flair vs Randy Savage / Hulk Hogan vs
Sid Justice
WrestleMania IX -
Yokozuna vs Hulk Hogan
WrestleMania 2000 - Triple H vs The Rock vs Big Show vs
Mick Foley
WrestleMania XXVII -
The Miz vs John Cena
I didn't mention Hogan, Piper, Orndorff and Mr. T originally as they main evented WrestleMania, the first PPV ever, and I thought that adding them would have made it too easy and obvious. How wrong was I?
I didn't include Mr. T and Lawrence Taylor because they aren't wrestlers and I thought it would have been too easy if I did add them. I purposely asked "wrestlers" and not "people" or "guys".