SANTA CLARA, Calif. -- For the first two drives of the game, Chip Kellys offense was clicking for the San Francisco 49ers. Blaine Gabbert made big throws, the running game was productive and the team converted third downs with ease.After jumping out to a quick 14-point lead, everything seemed to stall and the Niners stumbled to their third straight loss, falling 24-17 to the Dallas Cowboys on Sunday.We just couldnt keep that momentum going, left tackle Joe Staley said. It was very frustrating. It was just one of those games.The performance over the final three quarters is becoming all too familiar to the 49ers, who have struggled to generate much consistent offense in their first year running Kellys up-tempo, spread system.After gaining 143 yards, scoring two touchdowns and all six third-down opportunities in the first two drives, San Francisco was held to 152 yards, three points and just two third-down conversions over the final 43:55.We started fast like we wanted to all week, Gabbert said. Got the run game going. Got some passes in there. Jumped up to 14-0 and just stalled there a little bit. We got to watch the film to really see the reasons why.The Niners (1-3) made third downs a priority after failing to convert the first 10 opportunities in a loss at Seattle last week. That seemed to pay off when ran for one on the first drive and then followed up with two long conversions through the air.He hit Quinton Patton on a 13-yard pass on third-and-12 and then found Jeremy Kerley alone for a 33-yard touchdown on a third-and-7 play.Gabbert converted another third down with a keeper on the next drive and added a 13-yard pass to Garrett Celek to convert a third-and-9 before Carlos Hyde capped the drive with a 3-yard run on third-and-1 to make it 14-0.Thats about all the offense did all game as San Francisco converted its next third down on the following drive before going 1-for-7 the rest of the way, a big factor in another loss.The offensive woes could be summed up by the final drives in the fourth quarter. With San Francisco trailing 21-17, the offense took over near midfield with a chance to take the lead.Gabbert then took a rare deep shot down the field. Torrey Smith got behind the Dallas defense and Gabbert launched a pass his way that could have been a go-ahead touchdown if he had thrown it well. Instead, the pass was well behind Smith and Morris Claiborne managed to recover in time to make the interception .We were both frustrated, Gabbert said. That was a huge play in the game. Every game in the league comes down to one or two plays that change the outcome and that definitely had an impact on it and thats on me. I got to throw that ball to the middle of the field and let him go get it.Smith, who hadnt been targeted all game before that point, slammed his helmet in frustration as he went to the sideline.The Cowboys drove down for a field goal but San Francisco still had a chance to tie it on the next possession. Gabbert quickly moved the team to the Dallas 35 before the two-minute warning.Gabbert then threw an incomplete pass to Kerley on third-and-6 before connecting on a short throw to Smith, who was stopped 3 yards short of the marker .Dallas ran out the clock and the Niners were left to lament another loss.Gabbert finished 16 for 23 for 196 yards with the one TD and one interception. He also ran 12 times for 27 yards and still has Kellys confidence to remain the starter ahead of Colin Kaepernick.I thought Blaine played well besides that one throw, Kelly said.---Online:AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFLWholesale NBA Jerseys .com) - Christian Ponder will get another chance to prove himself for the Minnesota Vikings, with head coach Leslie Frazier announcing Wednesday that the struggling quarterback will start this weekends game against the Green Bay Packers. 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In response to an imposing total of 324, their visitors stuttered at the outset, lost wickets through the middle, and arrived at a limp finish. Sri Lankas 122-run defeat was an apt reflection of the chasm between the quality of the teams on display this series, which England have sewn up 3-0.Joe Root produced a seamless 93 from 106 balls to underpin his teams dynamic innings, but it was arguably Jos Buttler who played the most electric knock within it. He set off with a four to fine leg, collected quick runs into the outfield for a while, then after facing 25 deliveries, let fly with the boundaries. There were shovels over the shoulder, searing cuts, crunching drives and a six over long off, all executed with a powerful bottom hand. His tally was 70 off 45. James Vince had also hit a half-century at the top of the innings.Erratic seam bowling at either end of the innings had helped England to their imposing total. Most hopes of Sri Lanka running that score down then dissipated in the first 22 overs, after which they were 107 for 5. Dinesh Chandimal made his fourth consecutive fifty as the wickets fell around him, before David Willey wiped out the tail to finish with four wickets for himself. Sri Lanka were all out for 202, and never in the course of their chase, did they appear to have the measure of their target.In Englands innings, Danushka Gunathilakas part-time offspin claimed three wickets for 48 from his full quota of overs, but it was debutant left-arm seamer Chaminda Bandaras 1 for 83 which was the more definitive set of figures. Bandara was wayward at the outset while the other seam bowlers failed to pose a consistent threat, and costly at the death when everyone was going for runs. Nuwan Pradeep was also expensive again, giving away more than seven an over, as he attempts to come to grips closing out an innings.England had purred into motion with a cover-driven boundary from Jason Roys bat, third ball. Though play was soon left suspended for about 25 minutes by a passing shower, the hosts tempo rarely wavered over the following three-and-a-half hours. Bandara bowled overs that cost 11 and 14 in the Powerplay, while more experienced bowlers delivered more disciplined, but hardly miserly, spells. By the tenth over, only seven boundaries had been struck in all, yet 66 runs had been gathered. The green tinge on the pitch, which had put both captains in the mood to bowl first, offered only modest sideways movement.dddddddddddd The overhead cloud made for only the slightest swing.The dismissal of Roy came somewhat against the run of play - caught on the midwicket boundary off Suranga Lakmal for a run-a-ball 34. Root, the next batsman, sent his first ball skipping through the covers for four, and Vince continued his pretty progress alongside the new man, the pair flitting efficiently between their wickets until Vince reached his first international fifty, off 54 balls. He was soon out charging Gunathilaka, who pulled his length back and slipped a ball past Vinces advance, but neither that wicket, nor the next one, really dented Englands rate of progress. Halfway through the innings, the hosts were 138 for 3.With a confident Gunathilaka proving so successful, Mathews banked on spin through the middle overs. Jonny Bairstow was occasionally tested by it during his 21 off 28, but Roots mastery of the single prevented Sri Lanka from making substantial headway. This steady beat of ones and twos was occasionally enlivened by the crash of cymbals: the reverse-paddle for four off the exceptionally part-time bowling of Kusal Mendis, the clatter through the covers at the end of the 38th over.Buttler twice hit Pradeep for consecutive fours, and thwacked a six off Lakmal in the 44th over, as he scored 45 runs from the last 20 balls he faced. It was he who propelled Englands run rate past six, and though he was out in the 48th over to give Bandara his first international wicket, had laid the groundwork for a fast finish. Thirty-three runs were hit off the last three overs.When the chase got under way an inability to pierce the lively infield drew a fatal mistake from Kusal Perera, not for the first time in the series. He was out lbw to Willey at the end of the fourth over. Mendis and Gunathilaka attempted to build the platform Sri Lanka required, before committing another of Sri Lankas most common mistakes through the series: attempting to come back for a second run in the 14th over, Mendis was caught short by Bairstows throw.From 66 for 2, the match slipped quickly. Gunathilaka was lbw to Liam Plunkett for 48. Mathews had his stumps splayed by a yorker from the same bowler. Upul Tharanga was bowled first delivery by Adil Rashid, and Dasun Shanaka was stumped off him, some time later. When Seekkuge Prasanna was caught at fine leg by a diving Willey, Sri Lanka had crumbled to 170 for 7 in the 35th over. A brittle tail didnt hang around long. ' ' '