Brock Lesnar WWE UFC
Brock Lesnar, pictured during UFC 200 at T-Mobile Arena on July 9, 2016 in Las Vegas, will defend the WWE Universal Championship against Samoa Joe at Great Balls of Fire 2017. Getty Images

Four WWE superstars are unofficially in the running to be in the main event of SummerSlam 2017 on Aug. 20. The biggest match since WrestleMania 33 will be determined Sunday night at Great Balls of Fire 2017, WWE’s next “Monday Night Raw” pay-per-view.

Great Balls of Fire 2017 is scheduled to start at 8 p.m. EDT, and the pre-show gets underway at 7:30 p.m. EDT. Ordering the event on PPV costs $54.99, but fans can also watch the event with a live stream on the WWE Network. A subscription to the network costs $9.99 per month, though new subscribers get the first month free.

READ: WWE Great Balls Of Fire 2017 Predictions, Match Card

Brock Lesnar defends his WWE Universal Championship against Samoa Joe in the main event of Great Balls of Fire, and the winner will presumably have a match with the belt on the line at SummerSlam. The No.2 match on Sunday’s card, Roman Reigns vs. Braun Strowman, is essentially a No.1 contender match for the red brand’s top title.

In many respects, the Great Balls of Fire card is good enough for one of WWE’s “Big Four” PPVs. Lesnar vs. Joe has a big fight feel, while Reigns and Strowman have arguably had the best feud of 2017, thus far.

Seth Rollins and Bray Wyatt, two former WWE Champions, will have a match against one another at Great Balls of Fire. Big Cass and Enzo Amore are set to meet in the squared circle for the first time since their break up.

In addition to the main event, four other championships will be on the line Sunday night. However, there’s a good chance that none of the belts will change hands.

Lesnar is an overwhelming favorite to defeat Joe, and he’ll likely remain the WWE Universal Championship until he finally faces Reigns in a title match. Sheamus and Cesaro probably won’t lose the Raw Tag Team Championships to The Hardy Boyz just a few weeks after winning the belts from Matt and Jeff. Neville has been a dominant champion since winning the Cruiserweight Title at the Royal Rumble, so don’t expect him to drop the belt anytime soon.

The Raw Women’s Championship and the Intercontinental Championship might have the best chance of switching hands. Alexa Bliss defenders her belt against three-time champion Sasha Banks, and The Miz faces off with former IC champ Dean Ambrose.

It’d be hard to classify Lesnar as a heel, but he certainly isn’t a true babyface, either, with Paul Heyman at his side. That means there are no babyface champions on the “Monday Night Raw” roster. Naomi holds the SmackDown Women’s Championship, making her the only babyface champion in the entire company.

Below is the complete Great Balls of Fire match card. The PPV includes eight matches, including the pre-show.

WWE Universal Champion Brock Lesnar vs. Samoa Joe

Roman Reigns vs. Braun Strowman (Ambulance Match)

Raw Women’s Champion Alexa Bliss vs. Sasha Banks

Seth Rollins vs. Bray Wyatt

Intercontinental Champion The Miz vs. Dean Ambrose

Raw Tag Team Champions Cesaro & Sheamus vs. The Hardy Boyz (30-Minute WWE Iron Man Match)

READ: WWE Money In The Bank 2017 Results

Enzo Amore vs. Big Cass

WWE Cruiserweight Champion Neville vs. Akira Tozawa (Kickoff Match)