When are the best chances for an NCAA Tournament upset?

click to enlarge - shared on fancred

Upsets. You either love them, or you hate them. Either way, in which match ups does the underdog have the best chance?

The Guardian dug deep into the NCAA Tournament archives to see pinpoint the best possible chances for an upset in the tournament.  

"No10 seeds and No12 seeds have never won against a No1 seed in 23 attempts, but No11 seeds have upset a top seed 50 percent of the time. No8 seeds have historically punched well above their weight. When facing No2, No4, and No5 seeds, these teams have been particularly dangerous, winning well over 50 percent of games."