Time to separate the men from the boys.

Ultimate Fighting Championship (UFC) is bulking up its UFC on FOX 4 fight card and line-up, literally, adding a pair of super-sized heavyweights in the form of Ben Rothwell vs. Travis Browne, who are expected to do battle on Aug. 4, 2012 at the Staples Center in Los Angeles, California.

UFC officials brought word of the beefy brouhaha late last night.

Rothwell 2.0 erased the memories of last year's stinker against Mark Hunt by hitting the kill switch on heavyweight "Hybrid" Brendan Schaub. "Big" Ben looked downright little compared to previous appearances and used his newfound nimbleness to score a first round knockout at UFC 145 in Atlanta.

But he wasn't the only one turning some heads in the "Big Peach."

Brown has run his undefeated streak to 13 fights, marred only by a controversial draw against Cheick Kongo at UFC 120 in late 2010. He dug a grave for Strikeforce import Chad Griggs back on April 21 and is clearly ready for bigger and better things within the division.

Today Ben Rothwell, tomorrow top five?

UFC on FOX 4 is expected to feature the recently announced middleweight bout of Hector Lombard vs. Brian Stann. Ryan Bader vs. Lyoto Machida and Terry Etim vs. Joe Lauzon are also scheduled for the "City of Angels."

For the latest UFC on Fox 4 news and notes be sure to check out our complete event archive right here.