(Getty)UFC lightweight Nate Diaz has been suspended by the promotion for using a homophobic slur in a tweet about fellow fighter Bryan Caraway. After Pat Healy lost his UFC 159 Submission of the Night bonus for testing positive for marijuana, the bonus was given to Caraway. Diaz apparently didn't think Caraway should have accepted the money. Apologies for the language he used in the tweet showing on Cagewriter:

I feel bad for pat Healy that they took a innocent mans money and I think the guy who took the money is the biggest Fag in the world ..

— Nathan Diaz (@NateDiaz209) May 16, 2013

He followed that up with a slur against women.

#sorryasslittlebitch

— Nathan Diaz (@NateDiaz209) May 16, 2013

The UFC responded quickly, suspending Diaz as they investigate what their next move is. The promotion issued a statement on the matter.

Belfort facing off with Rockhold. (Getty)The UFC is in Brazil again for Saturday's UFC on FX bouts. The top of the card holds a contentious bout between two fighters who clearly don't like each other. What do you need to know before tuning in?

Will Luke Rockhold keep octagon jitters at bay? Luke Rockhold spent most of his career in Strikeforce. He worked his way up through the challengers system to become the promotion's final middleweight champion. Now, he finally gets a chance to show he belongs in the UFC. He won't have an easy entry, fighting Vitor Belfort, who is coming off of a TKO win over Michael Bisping in January. Will he avoid octagon jitters and keep his fight streak alive?

Has Ronaldo "Jacare" Souza continued to grow as a fighter? Souza well-credentialed in jiu-jitsu, but his fight game has become more well-rounded in recent bouts. He'll face Chris Camozzi, who is on a four-fight win streak. Will Souza show the complete fight game he did in Strikeforce?

Is Nik Lentz among the best of the loaded featherweights? Since dropping down to 145 lbs., Lentz is 2-0. He'll face Hacran Dias on his home territory. Both fighters have a chance at getting closer to Jose Aldo and the featherweight belt with a win. Which one will come away the winner?

Pizzi at left and Hernandez will fight (Miami Herald)Mayors in competing cities often place bets when there sports teams face off. Quite often, they offer the city's signature foods and gifts. For this year's Super Bowl, the San Francisco mayor spent a day in service in Baltimore after the Ravens won. But two mayors in south Florida are upending that tradition. They'll be the ones competing.

Carlos Hernandez, the mayor of Hialeah, and Michael Pizzi, the mayor of Miami Lakes, plan to square off for charity. It started as a discussion over dinner -- and a few drinks -- over who could beat each other up. It snowballed from there.

Hernandez, 52, says he has trained with the Gracies, one of MMA's most important families. Pizzi has another plan.

"Carlos is an athlete into aerobics," Pizzi said to MMA Junkie. "I'm of the Tank Abbott (and) Roy Nelson school of training, which is have a six-pack of beer, get off a bar stool and knock the guy out in the first three punches."

While Nelson does like to show off his belly, he's in a bit better shape than Pizzi says.

The two mayors haven't set a date for the bout yet as they are still looking for a promoter. The Miami Herald reports the fight will take place in Hernandez's home turf of Hialeah. Money they raise from the bout will go to programs benefiting children in each mayor's city.

(Getty)Vitor Belfort started his MMA career in 1996. To give you an idea of how long he has been around, consider this: When he made his debut, Michael Jordan and the Bulls were about to embark on their 72-10 season. Bil Clinton was the president. Yahoo was just two years old. "Beverly Hills, 90210," the greatest television show of all time, was on the air, and I was a senior in high school.

Since that first fight, a 12-second knockout of Jon Hess, he's fought 31 more times, putting together a record of 22-10. His 33rd fight is Saturday against Luke Rockhold, the 28-year-old Strikeforce middleweight champ.

Now 36, Belfort fought twice in a tournament at UFC 12. He knocked out two opponents in a total of two minutes. He went 1-2 against Randy Couture, beat Wanderlei Silva but lost to Kazushi Sakuraba. He's fought in Pride, Affliction and the UFC. He had Jon Jones in an armbar, coming the closest to beating Jones of any of the light heavyweight champion's opponents.

167686125Pat Healy made a memorable cross-over from Strikeforce at UFC 159. He submitted Jim Miller and won two bonuses to steal the show at the April event. Unfortunately, he also tested positive for marijuana after the fight. His fight result has been changed to no-contest, and he will have to give up the bonuses that totaled $130,000.

Thanks everyone for their support, made a huge mistake and gotta pay for it.

— Patrick Healy (@BamBamHealy) May 15, 2013

Healy both tweeted about the positive test and released a statement. He will be suspended for 90 days. Healy attributed the positive test to a night out with friends a month before the fight.

Marijuana's acceptance in the United States is growing. Medical marijuana laws are becoming more common, and it's legal in two states. However, it's still a banned substance that state commissions test for, and fighters know this going into their bouts. Healy apologized in his statement, and said he should have been a better role model.

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(Getty)After losing to UFC champions Anderson Silva and Jon Jones, Chael Sonnen called out Wanderlei Silva for a bout. Silva responded on Fuel's "UFC Tonight," and his words just may gross you out.

"Jon Jones and Anderson Silva have been too nice to Chael. I want to suck his blood. I want to smell it. Not just fight – I want to hurt him. Chael is a joke, man. He’s going to be second forever. He’s never going to be first," Silva said to Ariel Helwani.

MMA is a bloody sport, and we're used to seeing blood cover fighters, their clothes and canvases. But we are not vampires, sparkly or otherwise. Blood sucking, Wanderlei? Really? Perhaps Wand is a fan of the "Twilight" novels, but let's keep the vampire aspects out of MMA and in young adults novels, OK?

Sanko before her last fight (Sherdog)After winning her Invicta debut with a rear-naked choke, Laura Sanko was scheduled to fight on Invicta's July card. She had to pull out of her atomweight (105 lb.) bout. It wasn't an injury that knocked her off the card. She can't fight because she's pregnant.

Thx for all the well wishes! Sry I've been off twitter 4 a bit but this pregnancy is kicking my bootie so far&was waiting to tell the news!

— Laura Sanko (@laura_sanko) May 11, 2013

Sanko said she's about two and a half months along, so she will be well into her second trimester when the fights take place on July 13. Recent fights have been called off because of cuts, dehydration and injuries of every sort. It's nice to see a fight called for a good reason.

Female fighters have to submit proof of a negative pregnancy test before fights to get licensed. As an extra precaution, Invicta, an all-female promotion, does additional testing. Sanko found out with enough time that Invicta did find a replacement. Cassie Robb will fight Livia Von Pletterberg in Sanko's place.

This is Strikeforce champion Tarec Saffiedine's 2-year-old son, and he has some training to do on this laundry basket. Check out his technique on low kicks. Clearly, he has been watching his dad and learning from him. The older Saffiedine is making his UFC debut in July against Robbie Lawler. Will he be as effective as his son is against the laundry hamper?