Michigan State was passed by Villanova for the No. 1 ranking after Duke and Kansas lost three weeks ago. The Spartans were No. 3 at the time, but voters moved the fourth-ranked Wildcats to the top spot.
Look who's No. 1 now.
Michigan State (14-1) moved up to No. 1 in the poll released on Monday, receiving 43 of 65 first-place votes following previously top-ranked Villanova's loss to Butler on Saturday.
No. 2 Duke, up two spots, received 21 first-place votes, and No. 3 Villanova had one.
Michigan State won both of its games last week and hasn't lost since Nov. 14, when Duke beat the Spartans 88-81 at the Champions Classic in Chicago. The Spartans are No. 1 for the first time since the 2015-16 season, the 12th time overall.
"Any time we can be ranked No. 1 is a good thing," Michigan State coach Tom Izzo said after the Spartans beat Savannah State 108-52. "I also think there are five or six teams that could be No. 1."
One thing there certainly isn't: an undefeated team left in college basketball.
The Sun Devils (12-1) dropped to No. 4, and the Horned Frogs fell from the program's highest ranking to No. 16.