This chart shows the results of first round matchups by the seed numbers since 1990. This chart lists the number of the seed who won each of the 8 different first round matchups (1 vs 16, 2 vs 15, 3 vs 14, etc.) in each of the regions (West, Midwest, East, South). At the bottom of the chart is the number of upsets the occurred in each of the different matchups (An upset was defined a a higher seed, like 9, beating the lower seed, like 8, and so on.). The chart also includes the percentage of times that upset has occurred since 1990.