Photo: Scott Strazzante, The Chronicle  San Francisco 49ers' Jarryd Hayne tries to break a tackle attempt by Dallas Cowboys' Chris Jones during 1st quarter punt return during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Jarryd Hayne tries to break a tackle attempt...  San Francisco 49ers' Jarryd Hayne returns a punt in 1st quarter against Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Jarryd Hayne returns a punt in 1st quarter...  San Francisco 49ers' Jarryd Hayne watches scoreboard during 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Jarryd Hayne watches scoreboard during 4th...  San Francisco 49ers' head coach Jim Tomsula and Bruce Miller (49) during National Anthem before 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' head coach Jim Tomsula and Bruce Miller (49)...  San Francisco 49ers' Ahmad Brooks leads the team onto the field before 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Ahmad Brooks leads the team onto the field...  San Francisco 49ers' L.J. McCray in 1st quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' L.J. McCray in 1st quarter of 23-6 win over...  San Francisco 49ers' L.J. McCray in 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' L.J. McCray in 4th quarter of 23-6 win over...  San Francisco 49ers' Blaine Gabbert in 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Blaine Gabbert in 4th quarter of 23-6 win over...  San Francisco 49ers' Quinton Patton celebrates after his punt block for a touchdown in 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Quinton Patton celebrates after his punt block...  San Francisco 49ers' Arik Armstead watches 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Arik Armstead watches 4th quarter of 23-6 win...  San Francisco 49ers' Anquan Boldin enjoys 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Anquan Boldin enjoys 4th quarter of 23-6 win...  San Francisco 49ers' head coach Jim Tomsula during 3rd quarter of Niners' 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' head coach Jim Tomsula during 3rd quarter of...  San Francisco 49ers' Colin Kaepernick enjoys himself during 4th quarter of Niners' 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Colin Kaepernick enjoys himself during 4th...  San Francisco 49ers' Jerome Simpson, Vernon Davis and Anquan Boldin watch Quinton Patton's punt block for a touchdown in 4th quarter of 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Jerome Simpson, Vernon Davis and Anquan Boldin...  San Francisco 49ers' head coach Jim Tomsula during 3rd quarter of Niners' 23-6 win over Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' head coach Jim Tomsula during 3rd quarter of...  San Francisco 49ers' head coach Jim Tomsula has words with Vance McDonald in 1st quarter against Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' head coach Jim Tomsula has words with Vance...  San Francisco 49ers' Arik Armstead and Nick Moody (54) team up to stop Dallas Cowboys' Joseph Randle in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Arik Armstead and Nick Moody (54) team up to...  San Francisco 49ers' Vance McDonald is brought down by Dallas Cowboys' Andrew Gachkar in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Vance McDonald is brought down by Dallas...  San Francisco 49ers' Arik Armstead is double teamed by Dallas Cowboys in 2nd quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Arik Armstead is double teamed by Dallas...  San Francisco 49ers' Blaine Gabbert looks to pass in 2nd quarter against Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Blaine Gabbert looks to pass in 2nd quarter...  Line judge Catherine Conti works San Francisco 49ers and Dallas Cowboys' NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  Line judge Catherine Conti works San Francisco 49ers and Dallas...  San Francisco 49ers' Blaine Gabbert scrambles as Dallas Cowboys' Randy Gregory in 2nd quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Blaine Gabbert scrambles as Dallas Cowboys'...  San Francisco 49ers' Mike Davis rushes against Dallas Cowboys in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Mike Davis rushes against Dallas Cowboys in...  San Francisco 49ers' Blaine Gabbert looks to pass in 2nd quarter against Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Blaine Gabbert looks to pass in 2nd quarter...  San Francisco 49ers' Mike Davis rushes against Dallas Cowboys in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Mike Davis rushes against Dallas Cowboys in...  San Francisco 49ers' Carlos Hyde stiff arms Dallas Cowboys' Orlando Scandrick in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Carlos Hyde stiff arms Dallas Cowboys' Orlando...  San Francisco 49ers' Carlos Hyde rushes against the Dallas Cowboys in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Carlos Hyde rushes against the Dallas Cowboys...  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58) celebrate their sack of Dallas Cowboys' Brandon Weeden in 2nd quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58)...  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58) celebrate their sack of Dallas Cowboys' Brandon Weeden in 2nd quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58)...  San Francisco 49ers' Colin Kaepernick looks to pass while rolling out against Dallas Cowboys' Jack Crawford in 1st quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Colin Kaepernick looks to pass while rolling...  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58) celebrate their sack of Dallas Cowboys' Brandon Weeden in 2nd quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58)...  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58) team up to sack Dallas Cowboys' Brandon Weeden in 2nd quarter during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Quinton Dial (92) and Eli Harold (58) team up...  San Francisco 49ers' Craig Dahl celebrates his 2nd quarter interception against Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Craig Dahl celebrates his 2nd quarter...  San Francisco 49ers' Mike Purcell (64) celebrates with Quinton Dial after Purcell's 37-yard interception return for a touchdown in 2nd quarter against the Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Mike Purcell (64) celebrates with Quinton Dial...  San Francisco 49ers' head coach Jim Tomsula in 1st quarter against Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' head coach Jim Tomsula in 1st quarter against...  San Francisco 49ers' Mike Purcell during a 37-yard interception return for a touchdown in 2nd quarter as Dallas Cowboys' Mackenzy Bernadeau fails to make a tackle during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Mike Purcell during a 37-yard interception...  San Francisco 49ers' Mike Purcell (64) celebrates with Eric Reid (35) and Quinton Patton (11) after Purcell's 37-yard interception return for a touchdown in 2nd quarter against the Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Mike Purcell (64) celebrates with Eric Reid...  San Francisco 49ers' Mike Purcell during a 37-yard interception return for a touchdown in 2nd quarter as Dallas Cowboys' Mackenzy Bernadeau fails to make a tackle during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Mike Purcell during a 37-yard interception...  San Francisco 49ers' Vernon Davis points to the crowd before playing Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Vernon Davis points to the crowd before...  San Francisco 49ers' Colin Kaepernick (7) and Blaine Gabbert take the field for warm ups before playing Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Colin Kaepernick (7) and Blaine Gabbert take...  San Francisco 49ers' Carlos Hyde before playing Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Carlos Hyde before playing Dallas Cowboys...  San Francisco 49ers' offensive line prepares to play Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' offensive line prepares to play Dallas Cowboys...  San Francisco 49ers' Carlos Hyde (28) and Trey Millard take the field to warm up before playing Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Carlos Hyde (28) and Trey Millard take the...  San Francisco 49ers' Kendall Gaskins (40) and fellow running backs huddle before playing Dallas Cowboys during NFL preseason game at Levi's Stadium in Santa Clara, Calif., on Sunday, Aug. 23, 2015.  San Francisco 49ers' Kendall Gaskins (40) and fellow running backs...
The 49ers head coach insisted the running back who had a 53-yard run on his second carry was hardly guaranteed to make the final 53.  The former Australian rugby league star had three first-quarter touches, all on punt returns.  In the second half, he appeared at running back and had 54 yards on eight carries, including 34-yard gain down the left sideline in which he stiff-armed safety Jeff Heath to the turf near the line of scrimmage.  In two preseason games, Hayne is averaging 9.0 yards on 13 carries, 21.6 yards on five punt returns and returned his only kickoff 33 yards.  Inside linebacker NaVorro Bowman, playing in his first game in 19 months, stopped running back Darren McFadden on a one-yard gain on the first play from scrimmage.  Leading 16-0 in the fourth quarter, wide receiver Quinton Patton capped the 49ers’ scoring by blocking a punt, recovering the loose ball in the end zone and jumping into the stands to celebrate with the first Levi’s leap.