It's the 28th annual SummerSlam when the WWE presents the second-biggest event of the year live from the Barclays Center in Brooklyn on Sunday.

Brock Lesnar vs. The Undertaker in an epic WrestleMania XXX rematch and Seth Rollins vs. John Cena in a title-for-title, winner-take-all bout headline the card.

WWE SummerSlam 2015 Predictions & Preview

Event: WWE SummerSlam 2015

Time: 7 p.m. ET, (6 p.m. pre-show)

Venue: Barclays Center, Brooklyn, N.Y.

This event can be live streamed for free here (requires sign up for 30-day free trial)

Latest Rumors & Buzz For WWE SummerSlam

The Undertaker is looking to avenge the loss of The Streak to Lesnar at WrestleMania XXX in April 2014, while "The Beast" looks to put away "The Deadman" once and for all in the main event. As for Cena and Rollins, the stakes couldn't be any higher as the United States and WWE World Heavyweight Championships hang in the balance and one man will leave with both belts.

Two other big title matches have also been signed for SummerSlam. Ryback is set to defend his Intercontinental Championship against The Miz and The Big Show in a Triple Threat Match in one of those title clashes. In the other, the Prime Time Players put their Tag Team Championships on the line against The New Day, The Lucha Dragons and Los Matadores in a Fatal 4 Way tag bout.

Also on the card, the rivalry that former Shield stablemates Roman Reigns and Dean Ambrose have with The Wyatt Family will come to a head in a huge tag team encounter. These four have been going at it on-and-off for the last two years.

Other feuds that will be settled will the conflicts between Kevin Owens and Cesaro, Randy Orton and Sheamus and Dolph Ziggler and Rusev as these three singles matches are other highlights on the card.

Additionally, it just wouldn't be a huge WWE event without celebrity involvement and "Arrow" star Stephen Amell will team up with Neville to battle his chief rival Stardust and King Barrett.

The Divas Revolution will also continue when Team Bella battles Team B.A.D. and Team P.C.B. in a three-team, nine-Diva elimination tag team match.

Here is the final card for "The Biggest Party of the Summer":

The Beast vs. The Deadman
Brock Lesnar w/ Paul Heyman vs. The Undertaker

Title-for-Title Winner-Take-All
Seth Rollins (WWE World Heavyweight Champion) vs. John Cena (WWE United States Champion)

Tag Team Match
The Wyatt Family (Bray Wyatt & Luke Harper) vs. Roman Reigns & Dean Ambrose

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

WWE Tag Team Championships Fatal 4 Way (Pre-show)
The Prime Time Players (Titus O'Neil & Darren Young (c) vs. The New Day (Kofi Kingston, Big E and/or Xavier Woods) vs. Los Matadores (Diego & Fernando) vs. The Lucha Dragons (Sin Cara & Kalisto)

Three-way Divas Tag Team Match
Team Bella (WWE Divas Champion Nikki Bella, Brie Bella & Alicia Fox) vs. Team B.A.D. (Sasha Banks, Naomi & Tamina) vs. Team P.C.B. (Paige, Charlotte & Becky Lynch)

Tag Team Match
Neville & Steven Amell vs. King Barrett & Stardust

Singles Match
Randy Orton vs. Sheamus

Singles Match
Dolph Ziggler w/ Lana vs. Rusev w/ Summer Rae

Singles Match
Cesaro vs. Kevin Owens

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