The Timberwolves made a run in the third, pulling to within six before Southmoore closed strong to hold off Norman North.
Kyra Gilbert led Southmoore with 20 points, while Kayla Tucker added 18.
Bri Kuestersteffen led Norman North with 17, while Haley Woodard added 11.
BALANCED EFFORT PROPELS WESTMOORE
Three players scored in double figures as Westmoore's girls beat Norman 57-39.
Senior Victoria Gonzalez led the way with 13, while freshmen Sydney Chastain and Kaci Richardson added 12 and 11.
The Tigers stuck close for a quarter before the Jaguars opened an eight-point lead by halftime by outscoring Norman 15-8 in the second.
Norman continued to pull away after halftime.
Taylor Ely led Norman with 12 points, while Albany Anderson added 11.
TRACY LEADS CHA
Christian Heritage's Elizabeth Tracy has had to pick things up offensively recently.
Tuesday night, Tracy came up huge, scoring 25 points as the Crusaders blasted Crooked Oak 57-16.
CHA built a 39-10 lead by halftime and Crooked Oak didn't score more than five in any quarter.
McKenzie Cooper scored 31 points as Class 5A No. 1 Shawnee beat Noble 58-25. ... Erin Estep's 3-pointer in the final seconds lifted McLoud to a 38-37 win over Chandler. ... Abby Boyd scored 17 and Katy Fuston added 11 as Yukon's girls blew out Putnam City West 57-17. ... Junior Kylie Garrett scored 18 and Jacie Boyd added 10 as Blanchard beat the OKC Knights 69-21.