Michigan and Arizona boast elite efficiency metrics as the two No. 1 seeds to reach the Final Four. They have two of the best ratings in KenPom's data going back to the 1996-97 season. They're joined by an Illinois team that has put together a strong defensive showing through four NCAA Tournament wins. The Illini allowed their opponents to score on just 41.2% of their possessions. UConn is also in the Final Four after a stunning comeback against top overall seed Duke.