Technically, games start this upcoming weekend, but today there were a couple very high profile scrimmages, one between #4 Michigan State and #9 Tennessee (that Tennessee "won"), and one between #1 Kansas and #25 Illinois (that Illinois "won", theoretically extending Hunter Dickinson's career losing streak against Illinois).
Preseason AP top 25:
1
Kansas(46)
1548
2
Duke (11)
1466
3
Purdue (3)
1436
4
Michigan State (1)
1346
5
Marquette
1283
6
Connecticut (2)
1243
7
Houston
1117
8
Creighton
1099
9
Tennessee
1032
10
Florida Atlantic
1011
11
Gonzaga
830
12
Arizona
776
13
Miami (FL)
750
14
Arkansas
685
15
Texas A&M
597
16
Kentucky
530
17
San Diego State
529
18
Texas
493
19
North Carolina
474
20
Baylor
431
21
Southern Cal
427
22
Villanova
395
23
Saint Mary's
335
24
Alabama
163
25
Illinois
104