Sherdog’s Official Mixed Martial Arts Rankings It was a big weekend for fighters in the heaviest and lightest weight classes of the Ultimate Fighting Championship, as well as a few in between.

Pictures: WSOF 15 David Branch, Justin Gaethje and Jessica Aguilar picked up impressive wins at World Series of Fighting 15.

World Series of Fighting 15 Results: Play-by-Play & Updates Sherdog.com reports from the USF Sun Dome in Tampa, Fla., at approximately 7 p.m. ET with live World Series of Fighting 15 play-by-play.

World Series of Fighting 15 Weigh-in Results: Melvin Guillard Misses Weight For Title Fight World Series of Fighting is back with another mixed martial arts offering, this time serving up World Series of Fighting 15.

What to Watch For: World Series of Fighting 15 Justin Gaethje will put his perfect record and lightweight title on the line against Melvin Guillard on Saturday in Tampa, Fla.

WSOF 15: "Macaco" Patino vs. Eric Reynolds Added To Live NBCSN Telecast (PRESS RELEASE) -- LAS VEGAS — A lightweight (155 pounds) contest between legendary MMA pioneer and Brazilian Jiu-Jitsu and Judo black belt Jorge Patino (35-15-2) of Houston, Texas and battle-tested finisher...

Pictures: WSOF 8 ‘Gaethje vs. Patishnock’ Justin Gaethje, Anthony Johnson and Jessica Aguilar scored impressive victories at World Series of Fighting 8.

Justin Gaethje Stops Richard Patishnock in 69 Seconds, Takes Lightweight Gold at WSOF 8 Grudge Training Center prospect Justin Gaethje went after what he wanted, and Richard Patishnock made the mistake of getting in his way.

World Series of Fighting 8 Results: Play-by-Play & Updates Sherdog.com reports from the Seminole Hard Rock Hotel and Casino in Hollywood, Fla., with live World Series of Fighting 8 results and play-by-play.

WSOF 8 Weigh-in Results: Justin Gaethje, Richard Patishnock Cleared for Title Headliner Justin Gaethje will get to make his first pass at a major mixed martial arts championship in just his 11th professional appearance, as opponent ...