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CHAPEL HILL, NC - FEBRUARY 07: Rameses, mascot of the North Carolina Tar Heels, is passed around the student section during the game against the Virginia Cavaliers on February 7, 2009 at the Dean E. Smith Center in Chapel Hill, North Carolina. (Photo by Kevin C. Cox/Getty Images)

Freshman Walker Kessler scored a season-high 20 points to help North Carolina upset No. 11 Florida State 78-70 on Saturday.

It gave the Tar Heels a needed win to boost their NCAA Tournament chances while giving coach Roy Williams his 900th career victory.

The 7-foot-1 freshman had 14 of his points after halftime in an huge performance off the bench.

He provided a game-changing spark for a team that was down 16 with 2 1/2 minutes before halftime.

RaiQuan Gray scored 17 points to lead the Atlantic Coast Conference-leading Seminoles. Florida State shot 32% and committed 12 turnovers after halftime.