Louisville earned the top overall seed in the NCAA tournament Sunday, while Kansas, Indiana and Gonzaga also received No. 1s after a topsy-turvy regular season and another round of weekend upsets.

Louisville Cardinals celebrate winning Big East tournament (Chris Chambers/Getty Images)

The selection committee had its work cut out after five teams swapped the top ranking in The Associated Press poll, capped by West Coast Conference champion Gonzaga (30-2) moving to the lead spot for the first time in school history.

But it's No. 4 Louisville (29-5) that leads the 68-team field after a stunning turnaround to beat Syracuse for the Big East championship. No. 7 Kansas (29-5) defeated rival Kansas State for the Big 12 title, No. 3 Indiana (28-6) held on despite falling to Wisconsin in the Big Ten semifinals, while the Zags also got a coveted spot.

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