SummerSlam by the numbers: A match-by-match preview

— -- The 29th annual WWE SummerSlam pay-per-view takes place on Sunday at the Barclays Center in Brooklyn, N.Y. Since the inaugural SummerSlam in 1988, the event has been held in 13 different states, as well as one event each in England (1992) and Canada (2004). This is the second straight year that SummerSlam has taken place in Brooklyn (with at least one more year in Brooklyn guaranteed); the Staples Center in Los Angeles hosted the event from 2009 through 2014.

Brock Lesnar vs. Randy Orton

• Despite both superstars debuting on the WWE main roster in 2002,? Brock Lesnar?and? Randy Orton?have never faced off at a WWE pay-per-view event.
• SummerSlam was an important event for both early on in their careers; Lesnar defeated? The Rock?for his first WWE. Championship at SummerSlam in 2002, becoming?the youngest world champion in WWE history (25). Two years later at SummerSlam in 2004, Orton broke Lesnar's record, winning the world heavyweight championship at the age of 24.
• This will be Lesnar's fifth consecutive SummerSlam appearance, tied for second-longest active streak in the WWE;? John Cena?has the record, as 2016 will be his 13th?straight SummerSlam appearance.
• This will be Orton's 12th career SummerSlam appearance, fourth-most in WWE history.
• Lesnar competed in the main event at SummerSlam three of the last four years; he could tie? The Undertaker?for second-most if this match closes the show.

• Lesnar has not lost a one-on-one match since last year's SummerSlam, when he was defeated by The Undertaker.
• Orton lost at SummerSlam in each of the last two years -- to Sheamus in 2015, and to? Roman Reigns?in 2014.

WWE Universal championship: Seth Rollins vs. Finn Balor

• SummerSlam will be the first meeting between? Seth Rollins?and? Finn Balor.
• Rollins is 2-0 at SummerSlam, including a win last year over John Cena to become the first superstar in WWE history to simultaneously hold the WWE championship and the United States championship.
• Overall, Rollins has the third-highest WWE pay-per-view win percentage in WWE history (min. 25 matches)

• If Rollins wins and becomes the inaugural WWE universal champion, it would be the second instance in which he was the first to hold a title in WWE. On July 26, 2012, Seth Rollins won a tournament to become the inaugural NXT champion.
• SummerSlam will be Balor's first WWE pay-per-view match, and he will become the seventh man in WWE history to compete in a world title match in his pay-per-view debut. None of the previous six won their title matches.
• B?lor is looking to become the second WWE superstar to win a world title in his SummerSlam debut (Lesnar did so in 2002). He would also be the second Irish-born world champion in WWE history ( Sheamus), as well as the second former NXT champion to go on to become a WWE world champion (Rollins would be the other).

WWE world championship: Dean Ambrose (c) vs. Dolph Ziggler

The WWE world championship has changed hands eight times at SummerSlam, including five times in the last five years. CM Punk won the title in 2011 before Alberto Del Rio cashed in his Money in the Bank contract; Daniel Bryan won the title in 2013 before Orton cashed in his briefcase; and Lesnar won the title in 2014.

• This will not be the first one-on-one meeting between? Dean Ambrose?and? Dolph Ziggler?at a WWE pay-per-view event. At Night of Champions 2013, Ambrose defeated Ziggler?to?successfully retain his United States championship.
• SummerSlam will be Ambrose's 11th pay-per-view match of 2016 -- the most of anyone in the WWE this year. He has won each of his last five pay-per-view matches, with his last loss coming at the hands of Lesnar at WrestleMania 32.
• No one has appeared in more WWE pay-per-view matches in the last five years than Ziggler. SummerSlam will be his 50th pay-per-view match since the start of 2012 -- most in the WWE.

• Outside of the 2016 Royal Rumble match where the WWE World Championship was on the line, this will be Ziggler's first WWE World Championship match in nearly four years; he lost to CM Punk on SmackDown on Oct. 2, 2012.