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As Greg Jackson helps UFC welterweight champion Georges St Pierre prepare for his title defense at UFC 100, he says the two biggest weapons that challenger Thiago Alves can threaten St. Pierre with are his left hook and his knee.

As Georges St Pierre and Thiago Alves prepare to fight for the welterweight championship of the world at UFC 100, both have praised the first Ultimate Fighting Champion, Royce Gracie.

The rivalry between Georges St Pierre and BJ Penn is over in the sense that they're not going to step into the Octagon together again, but it's far from over in the sense that they're not going to stop talking about each other any time soon.

Penn has repeatedly called St. Pierre a cheater, and St. Pierre, in a call to promote UFC 100, took a swipe at Penn in discussing his upcoming opponent, Thiago Alves.

UFC welterweight champion Georges St Pierre and No. 1 contender Thiago Alves, who will meet at UFC 100, aren't just the top two welterweights in the UFC. They might also be the two biggest. On a call Thursday to promote their upcoming fight, St. Pierre and Alves said they both weigh more than 190 pounds right now, just over two weeks out from a UFC 100 weigh-in for which they'll have to tip the scales at 170.

UFC welterweight champion Georges St Pierre is a heavy favorite in his July 11 title defense against Thiago Alves at UFC 100, but as UFC President Dana White says in videos to promote the fight, Alves is probably the toughest challenger St. Pierre has faced, and this fight represents the biggest opportunity Alves has ever had as a professional fighter.

Mike Swick had another impressive victory Saturday, beating Ben Saunders at UFC 99, and in my view solidifying his status as a Top 5 welterweight in MMA.

And that means that if Georges St Pierre beats Thiago Alves next month at UFC 100, Swick will hold the distinction of being the best welterweight in the UFC that St. Pierre hasn't already beaten. That means Swick could be very close to a title shot, even though I think he probably needs one more win over a Top 10 opponent, like maybe Matt Hughes or Dan Hardy, who entered my Top 10 after beating Marcus Davis Saturday.

My full list of the Top 10 welterweights in MMA is below.

In a span of just 15 days, mixed martial arts fans were treated to the sight of two different fights involving one Top 10 pound-for-pound fighter taking on another: Lyoto Machida beat Rashad Evans at UFC 98 on May 23, and Mike Brown beat Urijah Faber at WEC 41 on June 7. That means it's time to revise our MMA rankings.

My latest list of the Top 10 Pound-for-Pound Fighters in MMA is below.

Four months after losing to Georges St Pierre at UFC 94, UFC lightweight champion BJ Penn is still angry that the Nevada State Athletic Commission didn't take action against St. Pierre for having grease rubbed on his body during the fight. In fact, Penn says he's so angry that he never wants to fight in Las Vegas again.

The three best pound-for-pound fighters in the UFC are middleweight champion Anderson Silva, welterweight champion Georges St Pierre and lightweight champion BJ Penn -- at least according to the rankings in the new UFC video game.

The web site PlanetXBox360.com has revealed the full rankings of all the fighters who are in UFC 2009 Undisputed. The list of the Top 10 pound-for-pound fighters in the UFC, with their point values in the video game, is below.

After two consecutive lackluster showings, UFC middleweight champion Anderson Silva is no longer considered by most observers to be the best pound-for-pound fighter in mixed martial arts, a new poll of MMA journalists has found. Instead, the consensus opinion now is that Fedor Emelianenko and Georges St Pierre are the best in the world, with Silva now third.