The Dallas Mavericks are interested in pursuing James Harden should he become a restricted free agent in the 2013 offseason, according to sources. Harden has until October 31st to reach an agreement on a contract extension with the Oklahoma City Thunder. The Houston Rockets and Phoenix Suns are also expected to pursue Harden. Read more: http://insider.espn.go.com/nba/stor...ey-oklahoma-city-thunder-future-espn-magazine