Saturday night is a great night for fights as a pair of the four recognized boxing welterweight titles will be on the line in Los Angeles. IBF champion Errol Spence Jr. (25-0, 21 KOs) will take on WBC champ Shawn Porter (30-2-1, 17 KOs) in a 147-pound unification bout from the Staples Center.

This fight presents the unique opportunity to unify while also bringing some interesting choices for the winner, as the champion could decide to take on the legend Manny Pacquiao for the WBA belt or cross the promotional street and take on WBC champ Terence Crawford.

According to Las Vegas, however, this shouldn't be much of a fight. Spence was as high as a -900 favorite at MGM sportsbook to start this week and has only come down slightly to -700. Porter, meanwhile, is down to +450 after being around +575 earlier in the week.

Respect box? Subscribe to our podcast -- State of Combat with Brian Campbell -- where we take an in-depth look at the world of boxing each week, including one-on-one interviews with both Errol Spence Jr. and Shawn Porter below.

In the co-main event, Anthony Dirrell puts the WBC super middleweight crown on the line against former champ David Benavidez. Dirrell claimed the title after Benavidez was stripped following a positive drug test. The former champ comes in as a heavy favorite to reclaim the strap.

The undercard is surprisingly strong with Mario Barrios (24-0, 16 KO) meets Baktyr Akhmedov (7-0, 6 KO) in a bout for a vacant secondary WBA title at 140 pounds and Josesito Lopez (36-8, 19 KO) vs. John Molina Jr. (30-8, 24 KO) in a matchup of rugged veteran welterweights.

Full card and odds

FavoriteUnderdogWeight

Errol Spence Jr. (c) -700

Shawn Porter (c) +450

Welterweight unification

David Benavidez -900

Anthony Dirrell (c) +575

Super middleweight

Mario Barrios -165

Baktyr Akhmedov +140

Super lightweight

Josesito Lopez -400

John Molina Jr. +275

Welterweight

Who wins Spence vs. Porter? How long does the fight last? And what prop bet should you make for a massive payout? Visit SportsLine right now to see Peter Kahn's best bets for Spence-Porter, all from the fight game insider who predicted Porter's upset of Danny Garcia.