SANTA CLARA, Calif. -- After getting run over for three straight weeks by backs such as Ezekiel Elliott, David Johnson and LeSean McCoy, the beleaguered San Francisco 49ers run defense may have caught a needed break.Tampa Bay back Doug Martin suffered a setback in his rehabilitation from a hamstring injury and might not be able to make it back in time for the Buccaneers (2-3) to play Sunday in San Francisco (1-5).It might not matter much since the Niners also allowed 100-yard games by lesser backs such as Fozzy Whitaker and Christine Michael during a five-game run of futility on run defense that has San Francisco on pace to allow the most yards rushing in a season since the 1985 Houston Oilers.Were all stunned, safety Antoine Bethea said. We havent been playing to our potential, havent been playing to the standard we set for ourselves.Things might have bottomed out last week in Buffalo when McCoy ran for 140 yards and three TDs and the Bills gained 312 yards in all on the ground in the second-worst rushing defense performance in 49ers history.Quite frankly, Im embarrassed by what happened on this past Sunday, defensive coordinator Jim ONeil said.While missing Martin could be a break for San Francisco, backup Jacquizz Rodgers is coming off the best game of his career with 30 carries for 101 yards two weeks ago against Carolina.That was the first time all season that the Bucs topped 100 yards rushing as a team in a game.Your run game gets better if you run it more, Tampa Bay coach Dirk Koetter said. Youve got to make yards, youve got to have efficient runs and youve got to be moving the chains. If youre doing that and youre running it more and youre repeating runs, your line and your backs both have a tendency to get stronger as you go.Here are some other things to watch on Sunday:KAP, PART 2: Colin Kaepernick made his first start at quarterback for the 49ers in nearly a year last week. He went 8-for-11 for 135 yards in the first half against the Bills, but struggled in the second half when he was just 5-for-18 for 52 yards and took three sacks. Kaepernick did show flashes as a scrambler with 66 yards rushing on eight carries, but knows its a fine line of when to stay in the pocket and when to run.There were a couple times that I wish I would have hung in a little bit more, but those are always split-second decisions that its always easier to look back and say, `I should have done this. I should have done that, he said.NO ACTION FOR JACKSON: The Bucs will be without receiver Vincent Jackson, who was placed on IR this week with an injured left knee. The three-time Pro Bowler had 15 catches for 173 yards in five games this season. His absence will allow defenses to pay even more attention to star receiver Mike Evans.When you lose a guy like Vincent to your team, he means a lot to our team because of the kind of pro he is, the kind of player he is and the kind of man he is, Koetter said.The Bucs do hope to get defensive tackle Gerald McCoy back from a calf injury that forced him to miss the previous game.THIN BACKFIELD: The Niners also could be without their starting back with Carlos Hyde expected to miss the game with a shoulder injury. That will leave the running duties mostly to Mike Davis and Shaun Draughn. Davis averages just 1.7 yards per carry on 47 career runs, while Draughn averages just 2.1 yards per carry this season and 3.3 in his career.BAY AREA DEBUT: Bucs QB Jameis Winston is set to play his first game ever in the San Francisco Bay area. But if he had to do it all over again, he might be more familiar with the region. Winston was accepted to Stanford out of high school and visited the school, but decided to sign with Florida State instead. Despite winning a Heisman Trophy and national championship with the Seminoles, Winston said in retrospect he might have chosen differently.Stanford is a great school, he said. You are who you put yourself around. Id have loved the opportunity to go to Stanford and be with some of my friends out there.RIGHT THE SHIP: After the Niners opened the season with a 28-0 home win over the Rams, little has gone right for first-year coach Chip Kelly. The team has lost five straight games for the first time since 2010 and is in danger of its first-six game skid since 2008, which led to Mike Nolans firing.The deal in this league is everything being so close, its in the details, Kelly said. Its in the little tiny things that separate winning and losing in this game and winning and losing is extremely close.---Online:AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFLDiscount Air Jordan .com) - The game was all punts and field goals before Kodi Whitfields catch. Wholesale Air Jordan . Rousey will put her perfect 8-0 record and hardware on the line against another undefeated fighter, 7-0 Sara McMann in the main event of UFC 170, which will be held at the Mandalay Bay Events Center in Las Vegas Nevada on February 22nd. https://www.wholesalejordanshoeschina.com/ . According to a report from the Vancouver Province, the Lions are expected to replace former DC Rich Stubler with defensive backs coach Mark Washington. Fake Jordan . -- In one brief spurt, Brazil turned a close game into a rout and proved again it will be a strong World Cup favourite. Air Jordan Sale . -- Canadian Andrew Wiggins got the ball on the wing, made a nifty spin move and then let go with a soft floater from about 10 feet that swished through the net in Allen Fieldhouse.FLORHAM PARK. N.J. -- Breno Giacomini insists hell be back on the football field at some point. The New York Jets right tackle just isnt sure when that will be.Giacomini is still dealing with a lower-back injury that will likely keep him out of the teams regular-season opener -- and perhaps longer.Right now, Im considered day-to-day, Giacomini said Thursday, the first time he spoke to reporters since being injured during minicamp in June. I dont know when Ill be back, but Im progressing.Giacomini, entering his third season with the Jets, has not practiced during training camp because of a strain and muscle spasms. He is on the physically unable to perform list and doesnt appear to be on track to be ready to play in the season opener against Cincinnati on Sept. 11.I honestly have no idea, coach Todd Bowles said when asked if he thought Giacomini would be ready to start the season. Its getting close and hes not practicing yet, so well see.Ben Ijalana and Brent Qvale have been splitting snaps at right tackle with the starting offense, but neither has started an NFL game. Bowles acknowledged that the Jets could also explore outside options.Wed consider it, he said. Weve talked about it and well continue to talk about it. Well see how they (Ijalana and Qvale) come along, and see who we want to add, if we want to add anybody.Giacomini says hes at aboout 80 percent speed and insists he will play this season, but is uncertain when hell be completely healthy.dddddddddddd He said he was able to get into a three-point stance and do some basic blocking techniques against air during practice Wednesday. He said he did some more things on Thursday.Its not where I need to be to be on the field, Giacomini said.The 30-year-old lineman said he expected his back to feel better a week or two after he injured it, but the pain increased during the July 4 weekend. Giacomini acknowledged that he has dealt with a similar back issue during his career, but it wasnt as intense as his current ailment.He didnt go into details about how it has been treated, declining to say whether he has received any injections. Giacomini did acknowledge that the injury is not a disk-related issue.Every day were taking a step forward, he said. No steps back, so thats a good thing.When asked if he could start the season on PUP, meaning he would have to miss at least the first six games of the season, Giacomini shrugged.Is it a possibility? he said. Probably. Its something I dont want, but thats something I cant control.---AP NFL website: www.pro32.ap.org and AP NFL Twitter feed: http://twitter.com/AP-NFL ' ' '