With Floyd Mayweather saying he has retired from boxing, the welterweight has relinquished his spot as the world’s No.1 pound-for-pound fighter. Two men who could potentially claim that title will fight at Madison Square Garden on Saturday night on the card highlighted by Gennady “GGG” Golovkin vs. David Lemieux.

Having dominated the middleweight division with 20 consecutive knockouts, Golovkin looks to add another title to his collection when he faces IBF champ Lemieux in a unification bout. While Golovkin has become increasingly popular because of his success, Roman “Chocolatito” Gonzalez has been unstoppable at 43-0 with 37 knockouts. He’s forcing fans to take notice of the flyweight division, and there might not be a better fighter in the world than the 112-pound champ.

Golovkin has been as good as any boxer over the last few years, but he has yet to prove himself against the best that the sport has to offer. The top boxers have avoided facing Golovkin, but he’ll take on his toughest opponent yet when he meets Lemieux at MSG. Lemieux has attained 31 of his 34 victories by knockout, most recently defeating Hassan N’Dam in a unanimous decision to win his title.

A loss for Golovkin would be an incredible upset, but Gonzalez is an even bigger favorite on Saturday. Golovkin is getting -1600 odds at Bovada.lv, and Gonzalez is a -2000 favorite to defeat Brian Viloria. Viloria is 36-4-2, and he’s been knocked out once in his career.

Another dominant performance for Gonzalez could cement himself as the world’s best boxer, but Golovkin will do his best to outperform the flyweight.

“It is important to show the world who is the best,” Golovkin told reporters this week. “This will be fun.”

A victory for Golovkin could set himself up for a future showdown with either Miguel Cotto or Canelo Alvarez. The two boxers will meet on Nov. 21 in Las Vegas.

Saturday’s pay-per-view begins at 9 p.m. ET, and four fights will be televised. In addition to the two big fights, Tureano Johnson takes on Eamonn O'Kane in a middleweight bout. Heavyweight Luis Ortiz defends his undefeated record against Matias Ariel Vidondo, as well.

Golovkin and Lemieux fight last, and probably won’t enter the ring until after 11 p.m. ET. The actual start time of the main event could be somewhere around 11:30 p.m. ET.

The PPV costs $49.95 for standard definition and $59.95 to purchase in HD.