Umeh's consecutive layups twice broke late ties and the second came on a nifty reverse that gave Dulles the lead for good at 63-61. Adrian Kuyinu gave Dulles a 66-61 cushion when he finished a 3-point play.
Dre Harrison scored 17 points and twin guards Abel and Thomas Galliguez connected on six 3-pointers for Dulles (34-4).
Elliott Lloyd scored 16 points to lead Klein Forest (33-4), which was down 49-30 midway through the third quarter.
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