DALLAS - Gersson Rosas resigned as general manager of the Dallas Mavericks on Tuesday, just three months into his new job. Rosas was hired Aug. 1 to fill a position that had been vacant since former coach and GM Don Nelson left the franchise eight years ago. Most of those duties fell to Nelsons son, Donnie, the president of basketball operations. Dallas owner Mark Cuban asked the younger Nelson to find an addition for the front office with stronger organizational skills, and Nelson came back with Rosas, who had been an assistant to general manager Daryl Morey in Houston. The 35-year-old Rosas, who reported to Nelson, said in a statement issued by the team that the job "was not the best fit for me at this point in my career." "The decision was made solely by me, as I firmly believe this change is in my best interest," Rosas said. "Mark Cuban asked me to reconsider my decision, but graciously accepted my decision and we part as friends." Rosas, a native of Colombia, spent nine years with the Rockets, rising from an intern to vice-president of basketball operations. He played a role in shaping the roster for a Houston franchise that beat out the Mavericks, Los Angeles Lakers and Atlanta in the pursuit of free agent centre Dwight Howard. Rosas also spent time as general manager of the Rio Grande Vipers, the Rockets developmental team. A decade ago, he was a graduate assistant with the University of Houston mens team. He was also a basketball co-ordinator for the Venezuelan national team at the 2002 world championships. "I was disappointed when Gersson told me of his decision, but I understand and all of us wish him the best," Cuban said. Rosas didnt return a call from The Associated Press seeking further comment, and Cuban didnt respond to an email. The Mavericks open the season Wednesday night at home against Atlanta. Gary Sheffield Jersey . 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Rooneys latest piece of football genius lost in the furore which now stalks David Moyes, and the man who gave the Manchester United striker his start as a 16-year old at Goodison Park back in 2002.PITTSBURGH -- The Pittsburgh Penguins hired Ray Shero as general manager eight years ago with the mandate to build a roster around two of the games brightest stars and turn ticker-tape parades through downtown into an annual rite of spring. Nearly a decade -- but just one Stanley Cup later -- Sidney Crosby and Evgeni Malkin find themselves on a perennially underachieving team. And Shero finds himself out of a job. The Penguins fired Shero on Friday, three days after another early playoff exit, this one a seven-game loss to the New York Rangers in the Eastern Conference semifinals. Coach Dan Bylsma remains in charge until Sheros replacement gets a chance to evaluate the entire organization top to bottom. "We share the disappointment of our fans that we have not had success in the playoffs over the past five seasons," co-owners Mario Lemieux and Ron Burkle said in a joint statement. "We believe that new leadership in the general managers office will bring a new approach and new energy, and help us return to championship form." Assistant general manager Jason Botterill will serve as general manager on an interim basis. Penguins President and CEO David Morehouse called Botterill a candidate to take over and believes whomever the team brings in wont need to make major changes on a club that won 51 games in 2013-14. "Its not a complete rebuild," Morehouse said. "This is a team that has had a level of success. What were trying to do now is get from good to great." Its a destination the Penguins reached only briefly during Sheros tenure, spending most of the time in a murky middle ground that made them one of the leagues model franchises during the regular season but a symbol of disappointment once the calendar crept into May and beyond. Pittsburgh won the franchises third Cup in 2009 but has failed to produce a bookend. Pittsburgh is just 4-5 in playoff series over the last five years after blowing a 3-1 series lead against New York. Morehouse didnt blame the 51-year-old Sheros ouster on one specific misstep. "This is a decision thats been in the works for a long time since weve won the Cup," Morehouse said. "We wanted to get back to the Stanley Cup finals and we havent and were going to make some changes." The Penguins brought Shero in before the 2006-07 season and tasked him with finding the right kind of players to complement Crosby and Malkins otherworldly offensive talent. It culminated on a giddy night in Detroit in 2009, when the Penguins edged the Red Wings 2-1 in Game 7 to earn the franchises third Cup, a run that included the crucial trade deadline acquisitions of forwards Chris Kunitz and Bill Guerin. It was supposed to mark the beginning of a dyynasty.dddddddddddd. Yet five seasons have come and gone with the Penguins in a familiar position: watching the final stages of the playoffs go on without them. It hasnt been for lack of trying. Shero remained aggressive in investing in a "win now" mode as the ensuing disappointments piled up. He enthusiastically said the Penguins were "all in" last year after trading for Jarome Iginla, Jussi Jokinen, Brenden Morrow and Douglas Murray. The moves often created headlines but little else, and boatloads of regular-season victories and a sellout streak seven years and counting proved no longer good enough. Whether Bylsma will be along for the ride remains unclear. The affable, open-minded Michigan native was a revelation when the Penguins promoted him from their American Hockey League affiliate in the spring of 2009, hoping his optimism would help a loaded team break out of a midseason funk. It worked brilliantly. Four months after taking the job, the former NHL nomad who spent nine seasons as a gritty fourth-line forward was raising the Cup in ecstasy. Considering Crosby and Malkin were both in their early 20s at the time, champagne toasts were expected. A half-decade later, Bylsma is the winningest coach in franchise history with 252 wins but the wait for another Cup run continues. While Pittsburgh enjoyed nearly unparalleled success from October to April -- including easily capturing the Metropolitan Division this year despite losing more than 500-man games to injury -- the Penguins again struggled to adapt in the post-season. Morehouse said the new general manager will determine whether Bylsma and the rest of the staff gets another shot. The 43-year-old Bylsma has two years remaining on his contract, the product of an extension he received last June as a vote of confidence from Shero following a four-game sweep at the hands of Boston in the Eastern Conference finals. The deal came with a promise to adopt a more defensive-minded approach. The Penguins even brought in longtime NHL coach Jacques Martin as an assistant, an old-school yin to Bylsmas new-school yang. Crosby took the blame for the teams underperformance as the Penguins cleared out their locker on Thursday. A day later the general manager ordered to put the leagues leading scorer in a position to keep Pittsburgh at the top was cleaning out his office. Whoever ends up redecorating will have his tough choices to make. At the same time, he gets to start with Crosby and Malkin firmly entrenched. Both players are signed through the rest of the decade. There are worse places to start. "A lot of teams would like to be where we are," Morehouse said. "However we do have high expectations and we do want to get to them." ' ' '