Dallas — Left tackle Trevion Mack walked to the sideline in the second quarter, flung his hands into the air and looked at quarterback Rickie Collins in frustration.

Syracuse had failed on its third fourth-down conversion attempt of the day. The first was a stuffed QB sneak. The second featured sophomore running back Yasin Willis being stuffed on a dive. The third: Collins overthrew a wide-open Willis for a walk-in touchdown.

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