UFC middleweight champion Anderson Silva has been lobbying for a super fight with GSP for years.
Whenever things look like they are close to happening, GSP seems to back out.

Most recently St-Pierre went on record by stating that his, sometimes training partner, Chris Weidman would finish Anderson and halt all discussions for a need to fight each other.
That hasn’t sit too well with Silva and he sounded off during yesterday’s conference call…
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“St. Pierre had his chance to pronounce himself fighting me and he chose not to do it. [So] that’s what he chose to say.”