RENTON, Wash. Sonny Jurgensen Jersey. -- For the first six weeks of the season, the Seattle Seahawks run defence was among the best in the NFL. In the eight games that have followed, the Seahawks have statistically been among the worst. What changed? "The run game has been solid except for some big plays weve given up to really good players," Seattle coach Pete Carroll said. "Were hoping to play a lot cleaner, a lot sharper." Over the first six games, the Seahawks were No. 2 in the NFL in yards rushing allowed per carry at 3.3 yards. That ability to stop the run put more pressure on the opponents passing game to find openings against Seattles secondary. But during the past eight games, the Seahawks have struggled. Theyre giving up 5.3 yards per carry, which ranks last in the NFL. Part of the problem is the big runs Seattles defence has allowed to running backs such as Adrian Peterson, Frank Gore and Reggie Bush. In five of the past eight games, the Seahawks have allowed their opponent at least 100 yards rushing as a team, after not letting any of their first six opponents reach that mark. Still, there are concerns that have allowed those big runs to happen in the first place. "We know that we have given up some big plays we know with Adrian and some backs," Seattle defensive co-ordinator Gus Bradley said. "Its still kind of a work in progress. Thats still our No. 1 emphasis after getting the ball." Seattle enters Sunday nights matchup against San Francisco still with the No. 2 scoring defence in the NFL -- right behind the 49ers -- and with the 10th ranked rushing defence. But it was the 49ers that started Seattle down the path of struggles with its run defence. It was a mix of defensive scheme and talent that helped Gore run for 131 yards when the teams faced off in Week 7. That remains Gores season high and the second-most yards rushing allowed by the Seahawks this season. San Francisco found its success by catching the Seahawks with some trap runs, especially in the second half that led to big running lanes for Gore. It was a smart move schematically as the Seahawks were unprepared. Linebacker K.J. Wright said this week hed never seen a trap play before until the 49ers ran one. "I was lost. I was like what was going on?" Wright said. While the trap runs caught Seattle by surprise in the first meeting, it will be how San Francisco uses mobile quarterback Colin Kaepernick thatll be new for the Seahawks this time. Kaepernick was just a spectator when the teams met in October. Since becoming the starter five games ago, Kaepernick has rushed for 202 yards, adding another element to the 49ers offence. The Seahawks defensive line took a hit this week when Jason Jones was placed on injured reserve with torn cartilage in his knee, but defensive tackle Alan Branch should be able to play despite an ankle injury. While Seattle did give up 118 yards rushing last week to Buffalo in an easy win, its victories over Arizona and Chicago featured a run defence that was more like what the Seahawks got earlier in the season. Seattle held Matt Forte to 66 yards and the Cardinals to just 43 yards rushing as a team. Those two efforts gave Bradley optimism that the run defence was heading in the right direction. "I thought the Arizona game we played better and the Chicago game for the most part weve played pretty well," Bradley said. "There are some good backs that we have faced ... Some of those guys are going to get their yards. For us the biggest thing is for us to keep the points down so we have a chance to win." Robert Griffin III Red Jersey. The report cited anonymous sources and said Armstrong was considering a confession to help restore his athletic career in triathlons and running events at age 41. 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Under the Collective Bargaining Agreement, the new deal cannot be signed until July 1.The NHLs Central Scouting Bureau has released its September rankings for North American prospects and to no ones surprise, Nathan MacKinnon and Seth Jones find themselves in prominent positions. The 17-year-old MacKinnon and the soon-to-be 18-year-old Jones are expected to be in a battle to be selected first overall in the 2013 NHL Draft. Hailing from the same hometown as Sidney Crosby (Cole Harbour, Nova Scotia), MacKinnon totaled 44 goals and 106 points in 75 playoff and regular season games for the QMJHLs Halifax Mooseheads last season as a 16-year-old. The 6-foot, 182-pound centre is coming off an impressive performance at the Ivan Hlinka Memorial tournament, finishing with five goals and 11 points in five games to help lead Cannada to its fifth straight tournament win. Doug Williams Jersey A 6-foot-3, 208-pound defenceman, Jones is the son of former NBA player Popeye Jones. After two seasons playing for the U.S. National Team Development Program Under-18 team, Jones will play with the WHLs Portland Winterhawks in 2012-13. He served as American captain at the 2012 World Under-18 Championship and helped his country win gold, recording eight points in six games. The competition for the No. 1 spot will begin in earnest on Friday, as both MacKinnon and Jones are scheduled to kick off their regular seasons. And dont forget to tune in on Thursday as TSN Hockey Insider Bob McKenzie presents his own Pre-season NHL Draft Ranking special at 7:30pm et/4:30pm pt. ' ' '