29 facts you need to know about WWE SummerSlam

With SummerSlam taking place Sunday, theScore is celebrating the WWE's biggest party of the summer throughout the week with an in-depth look. Here, we take a look at 29 essential facts - one for every year its taken place - you need to know about the history of the pay-per-view.

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1. The inaugural edition of SummerSlam took place at Madison Square Garden in New York on Aug. 29, 1988. The show was headlined by the Mega Powers ("Macho Man" Randy Savage and Hulk Hogan) defeating the Mega Bucks (Ted DiBiase and Andre the Giant) with special guest referee Jesse "The Body" Ventura.

2. SummerSlam has been held in 13 different states (New York, New Jersey, Pennsylvania, Michigan, Illinois, Ohio, Minnesota, North Carolina, California, Arizona, Washington, Massachusetts, and Indiana), as well as two other countries (England and Canada).

3. The 1992 show at Wembley Stadium in London set a SummerSlam attendance record that still holds strong to this day at 80,355.

4. This is the second-straight year SummerSlam will emanate from the Barclays Center in Brooklyn, which is the second time WWE has hosted the show in the same building on back-to-back occasions. The Staples Center in Los Angeles was home to SummerSlam from 2009-2014.

5. The Undertaker has the most victories in SummerSlam history at 10, with his most recent coming against Brock Lesnar in 2015.

6. Hogan has never tasted defeat at SummerSlam, going a perfect 6-0 with wins over The Mega Bucks, Savage and Zeus, Earthquake, Sgt. Slaughter's alliance, Shawn Michaels, and Randy Orton.

7. The first time the WWE World Heavyweight Championship changed hands at SummerSlam was in 1997 when Bret "The Hitman" Hart defeated The Undertaker with Michaels as the special guest referee.

8. Clocking in at 35:16, the distinction of being the longest bout in SummerSlam history goes to Team Cena vs. Team Nexus in a 7-on-7 elimination tag team match at the Staples Center in 2010.

9. The shortest advertised match was for the ECW Championship in 2009 when Christian retained against William Regal in just eight seconds.

10. John Cena will work his 13th SummerSlam on Sunday against A.J. Styles, tying Triple H for the second-most appearances all time.

11. Cena's 13 consecutive appearances is also a SummerSlam record.

12. Cena is currently riding a five-match losing streak at SummerSlam, all of which were for the WWE World Heavyweight Championship. He dropped his United States Championship in a title-for-title match against Seth Rollins in 2015.

13. Should Styles defeat Cena, he will become the first superstar since CM Punk in 2011 to beat him multiple times on pay-per-view in a singles match in a calendar year.

14. The Intercontinental Championship has changed hands 14 times, with the most recent switch coming in 2014 when Dolph Ziggler pinned The Miz.

15. By defending his Intercontinental Championship against Apollo Crews, The Miz will pass Ziggler and Mr. Perfect for the most such matches in SummerSlam history.

16. The Money in the Bank briefcase has been cashed in successfully twice to close a SummerSlam, with Alberto Del Rio (2011) and Orton (2013) both becoming champion.

17. Del Rio is the only man to compete in both the opener and closer of a SummerSlam in 2011, losing a six-man tag alongside The Miz and R-Truth against Rey Mysterio, Kofi Kingston, and John Morrison before cashing in his contract on Punk later in the night.

18. Kingston will team with New Day partner Xavier Woods to defend the Tag Team Championship against Karl Anderson and Luke Gallows on Sunday. It will be his fifth tag-team match at SummerSlam, setting a new record.

19. A win for The New Day on Aug. 21 will mark the one-year point since they became champions, making them just the second duo since 1985 (Demolition) to hold the belts for at least 365 days.

20. The New Day's title win at SummerSlam 2015 was the first time since 1999 that the Tag Team Championship had changed hands at the event.

21. Every champion who defended their title at SummerSlam 2014 walked away empty handed. Lesnar pinned Cena to become WWE World Heavyweight Champion, Paige defeated A.J. Lee to win the Divas Championship, and Ziggler beat The Miz for his fourth Intercontinental Championship.

22. The following superstars will be making their SummerSlam debuts on Sunday: Styles, Crews, Woods, Anderson, Finn Balor, Enzo Amore, Big Cass, Carmella, and Alexa Bliss.

23. Cena has wrestled in the most SummerSlam main events at six. Should Lesnar-Orton headline Sunday's show, "The Beast Incarnate" will tie Undertaker for the second-most in history at five.

24. Of the 28 main events in SummerSlam history, only 14 were for the WWE World Heavyweight Championship. That number doesn't include matches for the WCW Championship or World Heavyweight Championship of the same design.

25. A win for Balor against Rollins for the new WWE Universal Championship would make him just the second superstar to capture a World Championship in their SummerSlam debut (Lesnar, 2002).

26. SummerSlam will be Ziggler's 50th match on pay-per-view since 2012, making him the first and only superstar in the company to reach that number. He will challenge Dean Ambrose for the WWE World Heavyweight Championship.

27. WWE Hall of Famer Booker T and "The Charismatic Enigma" Jeff Hardy hold the dubious honor for having the most SummerSlam losses without a win, each possessing 0-5 records.

28. The following superstars competed on last year's SummerSlam card, but won't be wrestling this year: Big E, Titus O'Neil, Darren Young, Primo, Epico, Kalisto, Sin Cara, Neville, Stardust, King Barrett, Ryback, Big Show, Bray Wyatt, Luke Harper, Paige, Nikki Bella, Brie Bella, Alicia Fox, Tamina Snuka, and The Undertaker.

29. Six championships will be on the line Sunday (WWE World Heavyweight, Universal, Tag Team, Women's, Intercontinental, and United States), the most defended at SummerSlam since 2001 (eight).

- with h/t to Pro Wrestling About, ESPN, and Wrestling Inc