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An undisclosed injury has forced Yoshihiro Akiyama out of his July 21 welterweight bout at UFC 149, the promotion announced Tuesday on its website.

Former top welterweight contender Thiago Alves and Yoshihiro Akiyama have agreed to fight July 21 in Calgary, Alberta, at UFC 149, the promotion announced Tuesday night on its website.

These are the welterweight power rankings.

Josh Gross rates the performances of UFC on FX 2/Strikeforce fighters.

An overzealous approach and a lapse in concentration cost Thiago "Pitbull" Alves dearly against Martin Kampmann in the UFC on FX 2 main event.

From 2008 until August of 2010, Thiago Alves' strongest asset wasn't his tremendous striking skills. It was the poker face he wore before each fight. On the surface, Alves had the look of a man assured of winning. It did not matter who the opposit...

Science fiction writers could probably spend entire careers offering alternate histories for Martin Kampmann. Example: What if Kampmann hadn't come out on the losing end of a razor thin decision against Jake Shields at UFC 121? What if the judg...

After an inconsistent run, former top welterweight contender Thiago Alves will look for his second consecutive win March 3 when he faces Martin Kampmann in Sydney, Australia.

Former welterweight contenders Thiago Alves and Martin Kampmann have agreed to meet on March 3, a source with knowledge of the situation told ESPN.com on Wednesday.

These are the welterweight power rankings.

MMA schedule for 2011.

Thiago Alves labeled a potential future battle with Jake Ellenberger a "great fight" but he admits he is more than happy for the UFC to map out his future in 2012. More »...

Josh Gross rates the performances of UFC 138 fighters.

Mark Munoz carved Chris Leben to shreds at UFC 138, then called for a title shot.

Thiago Alves encountered yet more problems with weight cutting at the UFC 138 weigh-ins on Friday, failing to hit his target at the first time of asking. More »...

With superstars like Georges St. Pierre and Jake Shields, the welterweight division is always one of the most fun group of fighters to play as in the UFC video games. But who made the cut in "UFC Undisputed 3"? Check out the list of the 17 welterweig...