A stoppage time C.J. Sapong equalizer salvaged a draw for Sporting after KC spent the majority of the game battering Houston's goal.
Brad Davis put the visiting Dynamo ahead just before the hour mark.
As Kansas City peppered Hall's goal, one of the best chances came off a free kick when Chance Myers found himself free in the box, but only managed to direct the ball at Hall.
Deep into stoppage time Graham Zusi collected the ball, kept his composure and lifted it to the far post, where C.J. Sapong headed home the equalizer.
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