Preliminary odds and betting lines continue to shift for the upcoming UFC 117: Silva vs. Sonnen pay-per-view event from the Oracle Arena on Aug. 7 in Oakland, Calif., featuring a middleweight title fight between division champion Anderson Silva and number one contender Chael Sonnen.

After enjoying a bloated -700 line against Demian Maia at UFC 112, "The Spider" has lost some of his webbing, coming in at a more realistic -450 as the favorite against the mouthy ex-politician, Chael Sonnen, who currently stands as a +325 underdog.

That's Silva's closest line in the past few years, matching his -450 against Forrest Griffin at UFC 101.

Maybe it was his antics last April, or maybe Fedor Emelianenko's loss to Fabricio Werdum back on June 26 proved that no fighter is invincible -- including Silva. Keep that in mind if you want to try and make some money on Sonnen as the UFC heads to "The O."

Anderson Silva -450
Chael Sonnen +325