Preseason Week 1: Cowboys at 49ers

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Dallas Cowboys quarterback Dak Prescott throws a pass against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys players run off the field before an NFL preseason football game between the San Francisco 49ers and the Cowboys in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys players stand during the national anthem before the team's NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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09 August 2018: Views of the Dallas Cowboys during the first half of their NFL week 1 preseason game against the San Francisco 49ers at Levi's Stadium in Santa Clara, California. Photo by James D. Smith/Dallas Cowboys

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Dallas Cowboys wide receiver Michael Gallup, foreground, catches a touchdown pass in front of San Francisco 49ers defensive back Jimmie Ward (20) during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys wide receiver Michael Gallup (13) scores a touchdown pass in front of San Francisco 49ers defensive back Jimmie Ward during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys wide receiver Michael Gallup (13) celebrates after scoring a touchdown against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys wide receiver Michael Gallup, center, celebrates with teammates after scoring a touchdown against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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San Francisco 49ers quarterback Jimmy Garoppolo, left, throws a pass in front of Dallas Cowboys defensive end Demarcus Lawrence (90) during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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San Francisco 49ers running back Jerick McKinnon (28) is tackled by Dallas Cowboys cornerback Byron Jones (31) as defensive end Tyrone Crawford (98) looks over during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys' Lance Lenoir (14) runs past San Francisco 49ers' Raheem Mostert (31) an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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San Francisco 49ers running back Jerick McKinnon, foreground, carries against Dallas Cowboys defensive end Datone Jones (56), linebacker Jaylon Smith, center left, and linebacker Joe Thomas (48) during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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San Francisco 49ers tight end George Kittle (85) cannot catch a pass between Dallas Cowboys defensive back Jeff Heath, foreground, and linebacker Jaylon Smith, rear, during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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San Francisco 49ers offensive tackle Mike McGlinchey (69) blocks Dallas Cowboys defensive end Taco Charlton (97) during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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San Francisco 49ers quarterback C.J. Beathard (3) hands off during the first half of an NFL preseason football game against the Dallas Cowboys in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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San Francisco 49ers running back Matt Breida (22) runs against Dallas Cowboys linebacker Joe Thomas (48) during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys linebacker Joe Thomas (48) celebrates his interception with Damien Wilson (57) and Leighton Vander Esch (55) during the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys running back Bo Scarbrough (36) runs for a touchdown during the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys running back Bo Scarbrough (36) runs for a touchdown against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys running back Ezekiel Elliott (21) smiles as he runs off the field after the first half of an NFL preseason football game between the San Francisco 49ers and the Cowboys in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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Dallas Cowboys players run off the field at Levi's Stadium after the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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09 August 2018: Views of the Dallas Cowboys during the second half of their NFL week 1 preseason 24-21 loss to the San Francisco 49ers at Levi's Stadium in Santa Clara, California. Photo by Sam Smith/Dallas Cowboys

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Dallas Cowboys running back Bo Scarbrough (36) runs against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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San Francisco 49ers wide receiver Victor Bolden Jr. (17) runs against the Dallas Cowboys during the first half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys quarterback Dak Prescott (4) stands on the sideline during the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys wide receiver Lance Lenoir (14) catches a touchdown pass against the San Francisco 49ers during the second half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys wide receiver Lance Lenoir catches a touchdown pass against the San Francisco 49ers during the second half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys wide receiver Lance Lenoir (14) is congratulated by teammates after scoring a touchdown pass against the San Francisco 49ers during the second half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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Dallas Cowboys running back Bo Scarbrough (36) runs against San Francisco 49ers defensive back Chanceller James during the second half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Tony Avelar)

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San Francisco 49ers running back Jeremy McNichols (33) runs against Dallas Cowboys defensive back Kam Kelly during the second half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)

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Dallas Cowboys running back Trey Williams (34) runs against San Francisco 49ers defensive back Chanceller James, bottom, and linebacker Korey Toomer (59) during the second half of an NFL preseason football game in Santa Clara, Calif., Thursday, Aug. 9, 2018. (AP Photo/Josie Lepe)