Saturday at T-Mobile Arena in Las Vegas marks the biggest night of fights in 2017. The pay-per-view is headlined by the super-fight between Floyd Mayweather and Conor McGregor, but that’s just one of numerous bouts that will span the course of several hours.

It all starts at 7 p.m. EDT with the prelims, which are two hours of fights before the undercard begins. FOX will have the TV broadcast and viewers can watch a free live stream online with FOX Sports Go.

The preliminary card will feature two welterweight fights and two super middleweight fights. The undercard starts at 9 p.m. EDT on Showtime PPV, and it’ll feature bouts at 130, 175 and 200 pounds.

The prelims have lost some of the luster that they had just last week. The TV card was supposed to be headlined by Shawn Porter, but the boxer has since withdrawn from the fight because of a death in the family.

Porter was going to face Thomas Dulorme in a 10-round bout at 147 pounds, but he’s since been replaced by Yordenis Ugás.

“On behalf of Mayweather Promotions we send our prayers and deepest condolences to the Porter family,” said Leonard Ellerbe, CEO of Mayweather Promotions, in a statement. “In boxing we have to deal with curveballs that constantly come at us. Thomas Dulorme has been training hard and is ready to face Yordenis Ugas. Ugas is a tough competitor that shouldn't be overlooked, and Dulorme is ready. The fight fans are definitely in for an outstanding show between Dulorme and Ugas come Aug. 26.”

Porter is a former welterweight champion that was once in the conversation among possible opponents for Mayweather. After losing the WBA welterweight title fight to Keith Thurman a year ago, he defeated Andre Berto with a ninth-round TKO in April.

The biggest fight on the PPV undercard has also been altered. The fighters remain the same, but the junior lightweight champion no longer has an opportunity to successfully retain his belt. Gervonta Davis was stripped of his title Friday night for failing to make weight.

Gervonta Davis Floyd Mayweather
Gervonta Davis, pictured with Floyd Mayweather at Copper Box Arena on May 20, 2017 in London, will fight on the Mayweather-McGregor PPV undercard. Fans can watch the preliminary fights on TV or with a free live stream online. Getty Images

Davis had been boxing’s youngest world champion, winning the IBF junior lightweight title in January at just 22 years old. With the chance to showcase his skills in front of his biggest audience to date against challenger Francisco Fonseca, Davis missed the 130-pound limit, tipping the scale at 132 pounds.

The belt is now considered to be vacant, though Fonseca would win it by pulling off the upset.

“I'm young, I'm growing. I had a chance to make the weight I knew I couldn't make it & that's that. I will have a belt again,” Davis said on Twitter Friday night.

Below is the preliminary card, as well as the PPV undercard fights that are scheduled before the main event between Mayweather and McGregor.

Preliminary Card

Welterweight: Thomas Dulorme (24-2) vs. Yordenis Ugás (19-3)

Welterweight: Juan Heraldez (12-0) vs. Jose Miguel Borrego (13-0)

Super middleweight: Kevin Newman (7-0-1) vs. Antonio Hernandez (9-1)

Super middleweight: Savannah Marshall (0-0) vs. Sydney LeBlanc (4-3-1)

PPV Undercard

Junior lightweight: Gervonta Davis (18-0) vs. Francisco Fonseca (19-0-1)

Light heavyweight: Nathan Cleverly (30-3) vs. Badou Jack (21-1-2)

Cruiserweight: Andrew Tabiti (14-0) vs. Steve Cunningham (29-8-1)