KANSAS CITY, Mo. – DeMarcus Nelson scored a career-high 23 points, and No. 9 Duke rode a strong-shooting first half to a 71-56 victory over Air Force on Monday night in the semifinals of the CBE Classic.

Freshman Lance Thomas added 15 points, and Jon Scheyer finished with 12 for the Blue Devils (4-0), who will play the winner of Monday’s late game between Texas Tech and No. 13 Marquette on Tuesday.

Duke shot 74 percent (17-for-23) from the field in the first half, but the Blue Devils went cold after the break and didn’t make another shot after Greg Paulus’ 3-pointer with 5:45 left gave them a 59-47 lead.

The Blue Devils led 38-24 at halftime but didn’t score for almost three minutes to start the second half.

No. 12 Memphis 77, Oklahoma 65

LAHAINA, Hawaii – Robert Dozier had 13 points to lead a balanced Memphis offense, and the 12th-ranked Tigers beat Oklahoma 77-65 Monday in a sloppy opening-round game of the EA Sports Maui Invitational.

The Tigers (2-0) will play in the semifinals Tuesday against the winner of the game between No. 19 Georgia Tech and Purdue. Memphis, which starts three sophomores and a freshman, took control at the start of the second half by hitting seven of its first 10 shots.

to lead 58-42 with 12:04 left.

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