Amari Cooper, Trevon Diggs Go Head-to-Head

"Hard Knocks": Amari Cooper, Trevon Diggs go head-to-head at practice.

'Hard Knocks': Trevon Diggs' son finally gets to meet Dallas Cowboys QB Dak Prescott.

'Hard Knocks': Micah Parsons prepares for his first NFL game with DeMarcus Ware.

Watch this HBO's "Hard Knocks" preview of Dallas Cowboys quarterback Dak Prescott pitching his new tailgate game idea.

Watch the full episode of "Hard Knocks" following the Dallas Cowboys on HBO and HBO Max at 10 p.m. ET Tuesday.

TMI, Zeke? Watch the full episode of "Hard Knocks" following the Dallas Cowboys on HBO and HBO Max at 10 p.m. ET Tuesday.

Dallas Cowboys running back Ezekiel Elliott wraps a birthday present for quarterback Dak Prescott in this "Hard Knocks" preview trailer. Watch the full episode on HBO and HBO Max at 10 p.m. ET Tuesday.

As if there wasn't enough excitement for the start of training camp, HBO announced Friday that the Cowboys will be the featured team for its hit documentary series, "Hard Knocks."