Roy Jones Jr. to Anderson Silva -- HELL YEAH, I'LL FIGHT YOU

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Roy Jones Jr.
to Anderson Silva:
HELL YEAH, I'LL FIGHT YOU! ?If Anderson Silva WANTS Roy Jones Jr., he's gonna GET Roy Jones Jr. -- 'cause RJJ tells TMZ he'll accept Spider's challenge to a boxing match ... but the clock's tickin'.

We spoke to the 44-year-old former boxing champ in L.A. this week ... who says he heard Silva loud and clear when Anderson told the New York Post about his dream to fight a "great champion" like Jones.

38-year-old Silva is currently under contract with the UFC ... but suggested that UFC honcho Dana White should strike a deal to make the fight happen.

As for Roy -- once considered the best pound-for-pound fighter on the planet -- he tells TMZ, "I would love it ... Call me and we'll make that happen."

But Roy is concerned about his age -- and says if the fight is gonna happen, it's gotta happen ASAP -- in fact, Jones suggested the two get in the ring right after Silva fights Chris Weidman at UFC 162 on July 6.