DALLAS Sources with the Dallas Mavericks have confirmed to WFAA that the team and their general manager of three months, Gersson Rosas, have parted ways.

Rosas was hired away from the Houston Rockets in August where he served as executive vice president of basketball operations. He was hired by the Mavericks to assist the team's president of basketball operations, Donnie Nelson. Rosas was expected to provide a new, fresh voice within the team's front office.

'I made the personal decision to resign as general manager of the Dallas Mavericks after determining that the position was not the best fit for me at this point in my career,' Rosas said following the announcement on Tuesday. 'The decision was made solely by me, asI firmly believe this change is in my best interest.'

'I'm really not at liberty to comment, unfortunately,' Nelson told WFAA's Dale Hansen on Tuesday's News 8 at 6 broadcast. 'I will say that it's an unfortunate situation and we wish him nothing but the best.'

Rosas also said that Mavericks owner, Mark Cuban asked him to stay on with the team. 'Mark Cuban asked me to reconsider my decision, but graciously accepted my decision and we part as friends,' Rosas said.

Cuban said, 'I was disappointed when Gersson told me of his decision, but I understand, and all of us wish him the best,'.

The timing comes one day before the Mavericks are set to open their 2013-14 season against the Atlanta Hawks.

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