The Mavericks were hoping to be able to sign Dirk Nowitzki to a contract extension, but that is now unlikely according to a source. Nowitzki said last month that he would exercise his early termination option and explore free agency. When Nowitzki opts out, he will be leaving $21.5 million on the table. A new deal could start at a lower number, but would provide more security by stretching over four years. http://www.dallasnews.com/sharedcon...mavs/stories/062810dnspomavslede.1e02532.html