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-NFLClearance Basketball Shoes Store . Vokoun departed practice on Saturday morning after discovering swelling in his thigh. He was taken to a local hospital where the clot was revealed. The club announced the surgery following a 5-3 exhibition loss to the Columbus Blue Jackets. 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A sensational 96th-minute Luke DeVere equaliser has saved Matt McKays blushes to earn Brisbane a 1-1 draw against Melbourne Victory on the A-Leagues opening night.McKays dismissal after the hour mark had Victory on top, and Mitch Austin put them ahead seven minutes from time by lashing home a loose ball.Victory were set for three points on Friday night until a late set-piece was bundled home at the death, sparking frenzied celebrations from 15,805 at Suncorp Stadium.The goal was miraculous, with DeVere volleying over a stranded Lawrence Thomas while falling backwards.But in his first A-League start in 18 months after battling thigh and knee injuries, it was tough to begrudge DeVere his goal or the Roar their point.McKay received a yellow cards either side of halftime and was sent off in his 200th game.After receiving a first-half caution for swinging an arm at Fahid Ben Khalfallah, McKay earned his marching orders for tugging the Tunisian internationals shirt on 65 minutes.The skipper couldnt believe his fate, throwing his armband in referee Shaun Evans direction as his incensed coach John Aloisi remonstrated from the touchline.It allowed Victory to wrest back control of the match, which had failed to hit any great heights until then.The most interesting battle was that of the two Socceroos No.10s; A-League debutant Brett Holman and returning Victory midfielder James Troisi.Holman hit the ground running with a sparkling display, finding space and directing traffic in the Roars front third.Troisi wass bright but unable to link up effectively with teammates who werent at the club when he left two seasons ago.ddddddddddddBut he did create the best chance of the first half from a wide free kick, which debutant defender Alan Baro headed over from close range.Holman spurned a similar chance from milestone man McKays cross on 33 minutes.A man down, Brisbane gave up the ascendancy but looked set for a point.That is, until Austin reacted quickest when Ben Khalfallahs set piece bobbled from an aerial contest.Given their last visit to Suncorp Stadium - when the Roar found two goals at the death in last years elimination final - Victory were wise to be watchful until the final whistle.But they were stung again, with substitute Leigh Broxham fouling Maclaren, allowing DeVere to capitalise on Tommy Oars set piece.After seeing his side receive six yellow cards among nine for the night, Aloisi lashed Evans performance.Ill make one comment about the referee in my opinion. He wasnt good tonight, he said.Even with 10 men were still pushing and pushing and I couldnt be happier for someone like Luke Devere.Despite the last-gasp goal, Victory boss Kevin Muscat quickly made his peace with the result.I thought we were very good value. We played against a very good team, he said.If you analyse the result, youd be disappointed ... Ill analyse the performance and I thought we were very good. ' ' '