The Undertaker Brock Lesnar
A year and a half after Brock Lesnar ended The Undertaker's WrestleMania streak, the Deadman stopped the former UFC champ from winning the WWE World Heavyweight Championship.

WWE has made SummerSlam 2015 one of the biggest events in the history of the pay-per-view. With the event being extended to four hours, and 10 matches added to the card, a lot can happen at Barclays Center on Sunday.

The match between The Undertaker and Brock Lesnar will be in the main event, ahead of John Cena’s WWE World Heavyweight Championship match with Seth Rollins. It’s not often that the final match of a PPV is so difficult to predict, and the outcome could set up one of the biggest matches on the WrestleMania 32 card.

There had been rumors that Sting would have a SummerSlam match, but he is not on the card. The former face of WCW will be in New York City this weekend, so there is a chance that he could make a surprise appearance.

Below is a look at the card for WWE SummerSlam 2015, as well as predictions for each match.

Brock Lesnar vs. The Undertaker

When The Undertaker appeared at WWE Battleground, it appeared that he would get his revenge at SummerSlam for Lesnar breaking The Streak. But it’s looking more and more like the Deadman will lose to Lesnar for a second time. The former UFC Champ has yet to get the upper hand on his opponent, while The Undertaker has resorted to multiple low blows. Whether there’s some sort of interference or Lesnar supplexes The Undertaker out of the building, there’s a good chance Lesnar will leave SummerSlam with the victory, looking as strong as ever. The Undertaker should eventually get his revenge on Lesnar, but he might have to wait until WrestleMania 32 to do so.

Prediction: Brock Lesnar

Seth Rollins vs. John Cena (WWE World Heavyweight Championship vs. United States Championship Match)

With both titles on the line, there’s certainly a chance the match will end with some sort of unresolved finish. A double count-out or disqualification are both in play, with WWE possibly looking for both wrestlers to keep their respective titles and continue their feud over the next few PPVs. Rollins won’t win clean, but Cena has done a lot to bolster the United States Championship and there’s no need to make him a 16-time world champion just yet.

Prediction: Seth Rollins

Bray Wyatt And Luke Harper vs. Roman Reigns And Dean Ambrose

Wyatt used Harper’s help to beat Reigns at Battleground, and the 2015 Royal Rumble winner could get his revenge now that he has some help of his own. The Wyatt Family has continuously beaten members of The Shield on PPVs, and it’s time for Reigns and Ambrose to get a win of their own.

Prediction: Roman Reigns and Dean Ambrose

Kevin Owens vs. Cesaro

Owens has lost some steam since he beat Cena at Elimination Chamber, losing clean at two straight PPVs. Cesaro is gaining a lot of momentum with fans, doing so despite losing a few singles matches on “Monday Night Raw.” The Swiss Superman has been on the winning end of a few tag matches involving both wrestlers, so Owens might be in line for the victory on Sunday.

Prediction: Kevin Owens

Randy Orton vs. Sheamus

Unless Sheamus is going to cash in his Money in the Bank briefcase later in the night, which is certainly a possibility, there’s little reason for Orton to win. Orton is already one of WWE’s most established babyfaces. He defeated Sheamus at Battleground and he continues to win matches on “Raw.” With WWE looking to make Sheamus a top heel and a credible threat to win the WWE World Heavyweight Championship, he should go over at Barclays Center.

Prediction: Sheamus

Stephen Amell And Neville vs. Stardust And King Barrett

Considering a celebrity is teaming up with a babyface, there’s little chance that Stephen Amell And Neville will lose. Because Barrett was a late addition to the feud, Stardust should get pinned to end the match.

Prediction: Stephen Amell and Neville

Dolph Ziggler vs. Rusev

Rusev made his name in WWE by starting his career with a lengthy unbeaten streak, and Ziggler is known for making others look good in defeat, making Rusev the logical choice to win. A victory for the heel could also set up a rematch at Night of Champions next month, possibly including Lana and Summer Rae in a mixed tag match.

Prediction: Rusev

Team Bella vs. Team B.A.D. vs. PCB (Three Team Elimination Match)

Since Nikki Bella is the Divas Champion and her title is on the line, there is no reason for Team Bella to get the victory. The match could end with one of the recent NXT call-ups pinning Nikki and earning a title shot. Sasha Banks and Becky Lynch have bright futures in the WWE, but Charlotte is the most likely to win the Divas Championship first.

Prediction: PCB

Ryback vs. Big Show vs. The Miz (Intercontinental Championship Triple Threat Match)

It’d be surprising to see Ryback lose the belt in his first title defense that doesn’t end in a disqualification. There’s no reason to give Big Show any championship at this point in his career, and The Miz isn’t likely due for a title reign at any point soon.

Prediction: Ryback

The Prime Time Players vs. Los Matadores vs. The Lucha Dragons vs. The New Day (WWE Tag Team Championship Match)

It’s a fatal four-way, but only two teams have a real chance to win the titles. The New Day are consistently one of the most entertaining parts of “Raw,” and it was surprising to see them lose their belts so quickly. But they don’t necessarily need the belts, so it could be Titus O’Neil and Darren Young that leave SummerSlam as champions.

Prediction: The Prime Time Players