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Sue Ogrocki, Associated Press
Oklahoma coach Sherri Coale, left, signals to her team in the first half of an NCAA tournament second-round women's college basketball game against St. John's in Norman, Okla., Tuesday, March 20, 2012. From left are Coale, Sharane Campbell, Morgan Hook, Jelena Cerina and Kaylon Williams.

NORMAN, Okla. — Eugeneia McPherson scored 21 points, Shenneika Smith added 18 and St. John's advanced to the regional semifinals of the NCAA women's tournament for the first time in school history with a 74-70 win at Oklahoma on Tuesday night.

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The third-seeded Red Storm (24-9) came up with 21 points off of Oklahoma's 19 turnovers and were able to hold off a second-half charge to win in the second round for the first time in five tries.

Nadirah McKenith, who hit a buzzer-beater in an opening-round win against Creighton, had 13 points and seven assists and Da'Shena Stevens chipped in 11 points for St. John's.

Whitney Hand led No. 6 seed Oklahoma (21-13) with 16 points, seven rebounds and seven assists. The Sooners had a chance to tie on Aaryn Ellenberg's 3-pointer from the top of the key with 37 seconds left, but the ball ticked off the right side of the rim and went out of bounds.