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Alonzo Adams, Associated Press
Missouri's Michael Dixon (11) goes to the basket as Oklahoma's Casey Arent (32) defends during the first half of an NCAA college basketball game in Norman, Okla. on Monday, Feb. 6, 2012.

NORMAN, Okla. — Marcus Denmon scored 25 points, Ricardo Ratliffe added 15 points and 10 rebounds and No. 4 Missouri claimed first place in the Big 12 by edging Oklahoma 71-68 on Monday night.

Oklahoma (13-10, 3-8) had the ball with a chance to tie with 5 seconds left. Romero Osby was fouled with 2.5 seconds left and missed both free throws, and Steven Pledger missed a 3-pointer at the buzzer when the offensive rebound was tapped back to him.

The Tigers (22-2, 9-2) moved a half-game ahead of No. 6 Baylor and No. 7 Kansas in the standings. Those teams meet Wednesday night for a chance to pull even with Missouri.

Pledger led Oklahoma with 22 points and Sam Grooms had a career-high 17 points and 10 assists.