 After becoming the starting point guard for the Mavericks in the 2006–07 season, he helped lead the Mavericks to a team record of 67 wins in the regular season only to be upset by the eighth-seeded Golden State Warriors in the 2007 Playoffs.Halfway through the 2007–08 season, Harris was averaging career highs with 14.4 points per game and 5.4 assists per game.He was named a co-captain in 2007–08 along with Dirk Nowitzki.