A welterweight unification fight goes down Saturday at the Staples Center in Los Angeles, with Errol Spence listed as a -1100 favorite over Shawn Porter, who's getting +500 as the underdog.  You can also bet on how many rounds it lasts, whether the fight ends in a draw and whether Spence wins by KO/TKO, among many wagering options.

Before you pick this fight, you need to see what Peter Kahn has to say. A fight game veteran with over 20 years of experience as a manager, promoter and adviser, Kahn has his finger on the pulse of what goes on inside and outside the ring. He can be heard weekly as co-host of "The Fight Guys" podcast on the SB Nation Radio Network.

When Porter upset Danny Garcia, Kahn was all over the +130 underdog, telling readers "Porter's aggressive style and work rate will wear down Garcia and eventually find Garcia making careless mistakes and getting lured into a brawl." It played out just like Kahn predicted, and anyone who followed his advice cashed big!

Now, Kahn has scouted Spence vs. Porter from every angle and locked in his best bets, including one that pays over 20-1! You ABSOLUTELY need to see them before you make any picks of your own.

Who wins Spence vs. Porter? How long does the fight last? And what prop bet should you make for a MASSIVE payout? ... Join 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!