FORT WORTH, Texas — It took a little longer than expected, but TCU finally secured its first marquee victory of the season with an 80-71 win over No. 9 Oklahoma on Wednesday. It was the first Quad 1 win for TCU and should help bolster the Horned Frogs’ NCAA Tournament resume. While the game was tightly contested in the first half, Emanuel Miller and Avery Anderson helped break the game open in the second half. The key stretch started with just under 13 minutes to go as Oklahoma had just made it a two-possession game, 55-50. Anderson and Miller hit back-to-back 3-pointers to stretch the lead ba…