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LM Otero, Associated Press
Baylor's Brittney Griner (42) passes against Texas Tech's Shauntal Nobles (33) and Jordan Barncastle (1) during the first half of an NCAA college basketball game, Saturday, Feb. 18, 2012, in Waco, Texas.

WACO, Texas — Brittney Griner and the top-ranked Baylor Lady Bears are still undefeated and already have at least a share of the Big 12 conference title.

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Griner had 18 points, 14 rebounds and matched a career high with five assists as Baylor overcame one of its worst extended stretches of bad play all season for a 56-51 victory over Texas Tech on Saturday night.

Destiny Williams added 16 points for the Lady Bears (27-0, 14-0), getting most of her points on layups — several coming at key times. Her layup with 7:49 left, on a play started by Griner, broke a 46-all tie and put Baylor ahead to stay.

The Lady Raiders (17-9, 5-9) are the only Big 12 team to keep the final margin against Baylor under 10 points. They lost 72-64 at home a month earlier.