<P> In his next fight, at UFC 104, Sonnen outwrestled Okami for a unanimous decision victory . </P> <P> Sonnen was expected to face Nate Marquardt at UFC 110, but the fight was moved to UFC 109 on February 6 . Sonnen won a unanimous decision, after escaping two deep guillotine chokes in the first and third rounds . With the victory, Sonnen became the number one contender for the UFC Middleweight Championship . </P> <P> At UFC 117 on August 7, 2010, Sonnen challenged Anderson Silva for the UFC Middleweight Championship . Sonnen had trash talked to hype the fight, stating he was going to retire Silva . Heading into the fifth round, Sonnen led on the judges' scorecards (40--34, 40--36, and 40--35). At 3: 10 into the final round, Silva caught Sonnen in a triangle armbar and made him tap out . In a later interview, Sonnen stated it was the choke, not the armbar, that made him submit . The fight earned both fighters Fight of the Night honors, and was considered to be the best fight of the year by many critics . The fight was later awarded' Fight of the Year' by World MMA Awards . </P> <P> Urinalysis conducted after his loss to Anderson Silva showed Sonnen had an unallowably high testosterone / epitestosterone (T / E) ratio of 16.9: 1 at the time of the fight . An average man has a T / E ratio of 1: 1, and testing bodies may allow a ratio as high as 4: 1 for athletes undergoing TRT treatment . In other words, Sonnen's T / E ratio was nearly 17 times than a normal man's and over four times the allowed maximum for an athlete . He was fined $2,500 and suspended for one year (until September 2, 2011) by the California State Athletic Commission (CSAC). His scheduled rematch with Silva was subsequently cancelled . </P>

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