Pacquiao vs Marquez 3: 24/7 videos from HBO

The UFC is putting its best foot forward tonight (Sat., Nov. 12, 2011) with its landmark UFC on FOX 1: "Velasquez vs. Dos Santos" event airing live and free on network television. The big boys will be out to play, as Cain Velasquez defends his heavyweight title against Junior dos Santos.

But there's an even bigger (figuratively) match-up going down later in the evening.

That's because pound-for-pound king Manny Pacquiao is back in action tonight at the MGM Grand Garden Arena in Las Vegas, Nevada, against formidable foe and longtime rival, Juan Manuel Marquez.

These two have fought twice before, once in 2004 (read all about it right here) and again in 2008 (get up to date on that one right here).

So how does "Pacman" prepare for a man he's fought twice already? The HBO 24/7 crew followed both fighters and found out in the lead-up to tonight's explosive showdown. Watch every episode to catch yourself up after the jump.

REMEMBER: We will deliver LIVE coverage of "Pacquiao vs. Marquez 3" this evening, starting with the pay-per-view (PPV) undercard at 9 P.M. ET. CLICK HERE.