Reserve Chase McCarty scored 14 of his 20 points in the second half and Houston rallied for an 82-75 win over Oklahoma State.
Charlton boss Nathan Jones says the win over Birmingham City is "huge" but does not feel safe from relegation yet despite moving nine point clear of danger.
Desiree Wooten had 21 points, Zyanna Walker scored 19 and Colorado upset No. 20 Baylor 62-53 in the quarterfinals of the Big 12 Conference Tournament.
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