I like Vegas because there were so many late night dining places all within a 1-mile radius. This place was no exception. It's open until 3am (http://www.yelp.com/user_local_photos?userid=sAb47uEcSjK3uQcylhkhPw) and it was busy no matter the time of day/night. For a short wait, you can get a gooey, cheesy NY (or Sicilian) slice of pizza.
My brother, boyfriend and I were famished after the boxing match and decided to just take food in our hotel room. We figured that a slice wasn't going to cut it so we ordered an entire NY-style pepperoni and sausage pie (http://www.yelp.com/user_local_photos?userid=sAb47uEcSjK3uQcylhkhPw). We had to wait 20 minutes but it was well worth it - hot and fresh out of the oven. It wasn't greasy than most pizzas so I didn't get the overstuffed feeling afterwards. It definitely hit the spot. And the price tag on this colossal wide, thin and foldable slice was pretty reasonable in my opinion (about $3/NY, $4/Sicilian or $15/pie).
TIP: Don't let the long line fool you; it goes by pretty fast unless you order a whole pie which takes about 20 minutes.