The 2010 edition of the best day in college sports turned into arguably the greatest opening day in NCAA tournament history.

And it was a day that left many college basketball fans, including President Barack Obama, second-guessing their brackets.

The opening day of the NCAA tournament started Thursday with two games ending in overtime -- one going into double-overtime and the other involving a No. 15 seed -- and another game being decided by one point.

Just when it seemed the day could not get any better, a No. 13 seed stunned a No. 4 on a buzzer-beater and a No. 3 seed had to fight like mad to hold off a No. 14.

Unbelievably, Thursday's night cap was even better than the day's earlier games. A No. 14 seed actually knocked off a No. 3 and three more games were won on last-second shots, including yet another one decided in overtime.

By the time No. 3-seeded New Mexico held off No. 14-seeded Montana 62-57 early Friday morning, the carnage of the tournament's first 13 hours left researchers scrambling for the record books. Seven lower-seeded teams won games Thursday, including five double-digits seeds, the most on the opening day of the tournament since 1991.

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