#8 Villinova
The lowest seed to make it to the Sweet 16 in the NCAA basketball tournament this year was a 15th seed.
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Michigan State and University of North Carolina
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Since the NCAA implemented the 64 seed tournament format in 1985, the lowest seed to make it to the NCAA championship game was #8 seeded Villanova in 1985.
The finals of the 1939 NCAA Division I basketball championship, the first ever, was played at Patten Gymnasium in Evanston, Illinois which was home to the Northwestern University basketball team.
Oklahoma State (once known as Oklahoma A&M)made it to the NCAA men's basketball tournament finals (title game) in 1945, 1946 and 1949, winning the first two and losing to Kentucky 46-36 in 1949. All three of these occasions were when the school was still called Oklahoma A&M.
They have 4 titles. 1991, 1992, 2001, & 2010
Kentucky defeated Utah, 78-69, in the finals to win the 1998 NCAA Division I men's basketball tournament.