Why hasn't Anderson Silva signed his new UFC contract?

Put away those chemicals. If you really want to get rid of a "Spider," wave a 10-fight contract in his face.

Ultimate Fighting Championship (UFC) middleweight kingpin Anderson Silva has two fights remaining on his current ZUFFA deal. One of those is going to be cashed in for a title defense against Chris Weidman in the main event of UFC 162, which is set for July 6 at the MGM Grand Garden Arena in Las Vegas, Nevada.

And after that?

It's hard to say. The possibility of a "super fight" against reigning welterweight champion Georges St. Pierre is still the topic of conversation, but that would require a win over "The All American" for Silva (see the odds here), as well as a victory for "Rush" in his upcoming title defense against Johny Hendricks.

A new, 10-fight contract would certainly give him time to work out the logistics.

In fact, that's the deal that's on the table, according to UFC President Dana White, who wants to hang on to the 37-year-old champion until he eventually retires. How much is a contract for 10 fights worth when you're the top pound-for-pound fighter in all of mixed martial arts (MMA)?

Beaucoup bucks.

That begs the question ... why hasn't Silva signed on the dotted line? The Brazilian is notorious for stalling at the negotiating table, particularly when it comes to title defenses, but his stock may drop considerably if he's defeated this summer in "Sin City."

Maybe a loss to Weidman will prompt his retirement?

"The renovation is headed, we have more time to decide that. Let's see how it goes," Silva told Tatame.com.

It's tough to imagine "The Spider" being hard up for cash after signing big-money deals with Nike and Burger King. By his own admission, he's looking forward to concentrating on his Muay Thai college, which recently opened in California (see it here).

Anyone think UFC 162 is the final act for one of the sport's all-time greats?