WWE: WWE 2013- Alberto Del Rio vs The Big Show- World Heavyweight Championship

Source:WWE- Alberto Del Rio vs The Big Show for the WWE-WHC.

"Alberto Del Rio and Big Show clash during the main event of SmackDown for the World Heavyweight Championship in a Last Man Standing Match." 

From the WWE

I don't know much about Albert Del Rio, but he can't be more than 240 pounds. And he was going up against a man who was at least 7'0 and weighed 450 pounds in The Big Show (real life height and weight) with a lot of that weight being muscle. So at least on paper this looks like a mismatch. 

But in a last man standing match you can take all the punishment that you can physically take, but if you avoid getting counted out or submitting and your opponent makes a big mistake, which is what Big Show did, you have the ability to recover and deliver a lot of punishment with no rules. So now it's Albert Del Rio and his 240, plus every hard, heavy object that he can find, against one big man. With Big Show not able to do anything about it.