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Andy Wittry | NCAA.com | December 31, 2017

Undefeated college basketball teams in 2017-18

And then there were none.

Three college basketball teams entered Saturday, Dec. 30 with perfect records. All three came away with their first losses of the season.

No. 1 Villanova couldn't rally back against hot-shooting Butler while TCU failed to stop Trae Young (39 points) in a one-point defeat. To wrap up the night, No. 3 Arizona State suffered its first setback against in-state rival Arizona in Tucson.

Saturday's craziness means that this will be the first season since 1948-49 where no Division I teams entered January without a loss, per ESPN Stats & Info. The last undefeated team didn't lose last year until Feb. 25 (Gonzaga).

Click here to see how each of the last unbeatens from the past 15 years fared in the postseason. Where will Villanova, Arizona State and TCU fit on this list?