Now when i mean main event, i mean the match that actually closed the show, not necessarily the WWE Championship match.
1988: The Mega Powers (Hulk Hogan and Randy Savage) vs. The Mega Bucks (Ted DiBiase and André the Giant) with special guest referee Jesse Ventura
1989: Hulk Hogan and Brutus Beefcake vs. Randy Savage and Zeus
1990: The Ultimate Warrior (c) vs. Rick Rude in a Steel Cage match for the WWF Championship
1991: Hulk Hogan and The Ultimate Warrior vs. Sgt. Slaughter, Colonel Mustafa, and General Adnan in a 2-on-3 Handicap match with special guest referee Sid Justice
1992: Bret Hart (c) vs. The British Bulldog for the WWF Intercontinental Championship
1993: Yokozuna (c) vs. Lex Luger for the WWF Championship
1994: The Undertaker vs. "The Undertaker"
1995: Diesel (c) vs. King Mabel for the WWF Championship
1996: Shawn Michaels (c) vs. Vader for the WWF Championship
1997: The Undertaker (c) vs. Bret Hart for the WWF Championship with special guest referee Shawn Michaels
1998: Stone Cold Steve Austin (c) vs. The Undertaker for the WWF Championship
1999: Stone Cold Steve Austin (c) vs. Mankind vs. Triple H for the WWF Championship with special guest referee Jesse Ventura
2000: The Rock (c) vs. Kurt Angle vs. Triple H for the WWF Championship
2001: Booker T (WCW) (c) vs. The Rock (WWF) for the WCW Championship
2002: The Rock (c) vs. Brock Lesnar for the Undisputed WWE Championship
2003: Triple H (c) vs. Chris Jericho vs. Kevin Nash vs. Shawn Michaels vs. Randy Orton vs. Goldberg in an Elimination Chamber match for the World Heavyweight Championship
2004: Chris Benoit (c) vs. Randy Orton for the World Heavyweight Championship
2005: Hulk Hogan vs. Shawn Michaels
2006: Edge (c) vs. John Cena for the WWE Championship
2007: John Cena (c) vs. Randy Orton for the WWE Championship
2008: The Undertaker vs. Edge in a Hell in a Cell match
2009: Jeff Hardy (c) vs. CM Punk in a Tables, Ladders, and Chairs match for the World Heavyweight Championship
2010: Team WWE (John Cena, Daniel Bryan, Edge, Chris Jericho, Bret Hart, R-Truth, and John Morrison) vs. The Nexus (Wade Barrett, Justin Gabriel, Heath Slater, David Otunga, Skip Sheffield, Michael Tarver and Darren Young)
2011: CM Punk (c) vs. John Cena (c) for the Undisputed WWE Championship with special guest referee Triple H
2012: Brock Lesnar vs. Triple H
2013: John Cena (c) vs. Daniel Bryan for the WWE Championship with special guest referee Triple H
2014: John Cena (c) vs. Brock Lesnar for the WWE World Heavyweight Championship