Data: NCAA Tournament Upsets – Upset Percentage by Seed & Year

[Includes 2023 Tournament Results Not  2024]

Every year the “madness” is put into March Madness with plenty of upsets – especially in the first round of games. But just how often do they happen? And based on tournament history, what are your chances for accurately picking that 15 seed over 2 seed upset? 

How many times has the 16 seed beaten the #1? Since 1985, the #16 seed has beaten the #1 seed….just twice. The 16 seed has a pretty darn good record at 150-2. 

How man times has the 15 seed beaten the #2 seed?  It is still very rare, but the #15 seed has won 11 times – so the 15 seed has a record of 141-11 since 1985.

How man times has the 14 seed beaten the #3 seed?  This has happened 22 times since 1985 – so about once every 9 games. 

16 defeats 1 15 defeats 2 14 defeats 3 13 defeats 4 12 defeats 5 11 defeats 6 10 defeats 7 9 defeats 8
Games Played: 1985-2023 152 152 152 152 152 152 152 152
# Upsets 2 11 22 32 53 54 59 69
% Upsets 1.32% 7.24% 14.47% 21.05% 34.87% 35.53% 38.82% 45.39%

March Madness Upset Data by Year

wdt_ID Year 16 defeats 1 15 defeats 2 14 defeats 3 13 defeats 4 12 defeats 5 11 defeats 6 10 defeats 7 9 defeats 8
1 2023 1 1 0 1 0 1 1 0
2 2022 0 1 1 2 2 0 2 1
3 2021 0 1 1 2 1 2 2 1
4 2020 - - - - - - - -
5 2019 0 0 0 1 3 1 3 4
6 2018 1 0 0 2 0 2 1 3
7 2017 0 0 0 0 1 3 1 1
8 2016 0 1 1 1 2 3 2 3
9 2015 0 0 2 0 0 2 1 0
10 2014 0 0 1 0 3 2 1 1
11 2013 0 1 1 1 3 1 1 2
12 2012 0 2 0 1 2 2 2 1
13 2011 0 0 0 1 1 3 1 1
14 2010 0 0 1 1 1 2 3 2
15 2009 0 0 0 1 3 1 3 2
16 2008 0 0 0 2 2 1 1 2
17 2007 0 0 0 0 0 2 0 3
18 2006 0 0 1 1 2 2 2 1
19 2005 0 0 1 1 1 1 1 3
20 2004 0 0 0 0 1 0 1 1
21 2003 0 0 0 1 1 1 2 2
22 2002 0 0 0 1 3 2 1 0
23 2001 0 1 0 2 2 2 2 3
24 2000 0 0 0 0 0 1 2 0
25 1999 0 0 1 1 2 0 4 4
26 1998 0 0 1 1 1 2 3 1
27 1997 0 1 1 0 1 0 2 2
28 1996 0 0 0 1 2 1 2 3
29 1995 0 0 2 1 1 1 1 2
30 1994 0 0 0 0 2 1 2 4
31 1993 0 1 0 1 1 1 0 2
32 1992 0 0 1 1 1 0 2 3
33 1991 0 1 1 1 1 2 2 1
34 1990 0 0 1 0 2 1 1 2
35 1989 0 0 1 1 1 4 1 4
36 1988 0 0 1 1 0 1 1 1
37 1987 0 0 1 2 1 0 2 3
38 1986 0 0 2 0 1 1 1 0
39 1985 0 0 0 1 1 3 0 0
40 0 10 23 33 52 54 59 69