Courtesy of SoonerSports.com

KANSAS CITY, Mo. -- Oklahoma's freshmen might be peaking at just the right time.

Led by a stout second-half effort from Sharane Campbell and Kaylon Williams, the Sooners advanced to their fourth consecutive Big 12 Championship semifinal with a 70-59 win over Missouri Thursday at Municipal Auditorium.

Campbell scored 17 of her 22 and Williams all of her career-high 12 points in the second half as Oklahoma rallied from one of its worst halves of shooting performances to one of its best.

The Sooners hit just 26 percent of its shots in the first half, its second lowest percentage of the season and worst since 25 percent against Missouri on Jan. 28. But then the teams traded sides of the court in the second half and, likewise, shooting proficiency.

Missouri missed 18 of its 26 second-half field goal attempts while Oklahoma hit a season high 58 percent (14 of 24) over the final 20 minutes.

Campbell added 12 at the free throw line while Williams corralled 10 rebounds for the second double-double of her career.

Aaryn Ellenberg scored 12 points and Whitney Hand had 10 to complete four Sooners in double figures.

Six-foot-3 Christine Flores led Missouri with 18 points, but was shutout for the first 10 minutes of the second half as the 5-10 Campbell suffocated the senior for most of the period.

One way or another, the Sooners have a chance to enact some revenge in their semifinal. OU will play the Texas A&M-Kansas winner. Kansas upset Oklahoma in the regular season finale, while Texas A&M has been OU's loss in the past three Big 12 tournaments.

The game will tip-off Friday at 2 p.m.