The chart below shows the seed number of each team that won its first round game in the NCAA Basketball Tournament over the past twelve years (since 1990). It is broken down into years and also by the four different regions of the bracket. At the bottom of the chart are two numbers under each contest (1 vs 16, 8 vs 9, etc.). The first number indicates the upset total in that matchup over the past 12 years, with the percent of those games that end in an upset. The second number indicates the average number of times each year these upsets occur. This number is out of four possibilities (because there’s a 1 vs 16 matchp in the (1)South, (2)West, (3)East, and (4)Midwest).