Miami's Eric Washington scored to give the Redhawks a 60-54 lead with 2:26 to play. Kent State's Devareaux Manley scored five straight points and then grabbed a defensive rebound before Ortiz's dunk with 42 seconds remaining.
Miami had the ball with 17.7 seconds to play, but the Golden Flashes stripped it twice before Washington's shot missed with 4.4 seconds left. Ortiz grabbed the board and was fouled, but missed the front end of a one-and-one. Willie Moore's 3-point attempt at the buzzer hit the glass, sealing it for Kent State (16-7, 7-3 Mid-American).
Manley finished with 20 points and Ortiz chipped in 16. Marquiez Lawrence grabbed 10 rebounds for Kent State.
Washington scored 17 points to lead Miami (8-15, 3-7).