Louisville is new No. 1, unranked Michigan goes to No. 4

Louisville head coach Chris Mack, right, talks with Louisville guard Lamarr Kimble during the second half of an NCAA college basketball game against Western Kentucky Friday, Nov. 29, 2019, in Nashville, Tenn. (AP Photo/Mark Zaleski)

Louisville is the latest No. 1 following an unexpected loss by Duke. Michigan has matched a record by debuting at No. 4.