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The Cowboys are closing in on their preseason opener. Dallas will open up preseason play at home against the Jacksonville Jaguars tomorrow afternoon. Offensive lineman Chuma Edoga hyperextended his right knee at yesterday's practice. Elsewhere on the injury front, rookie tight end Luke Schoonmaker is continuing to increase his workload after making his return from the non-football injury list. Schoonmaker was selected in the second round of April's NFL Draft.