( CNN ) -- The NBA Finals are now all-square at 2-2 after the Dallas Mavericks defeated the Miami Heat 86-83 in a thrilling Game Four of the best-of-seven-series . Once again in-form Dirk Nowitzki top scored for the Mavericks , scoring 21 points , with 10 of these coming in the final quarter , as the lead changed hands no fewer than 12 times on Tuesday . German Nowitzki , who performed to his best despite suffering from a fever , also helped himself to 11 rebounds , while Shawn Marion scored 16 points and Tyson Chandler finished with 13 points and 16 rebounds for the Mavericks . Wade turns up Heat on Mavericks . Jason Terry and DeShawn Stevenson made significant contributions from the bench , coming on to score 17 and 11 points respectively for the Mavericks in front of a crowd of 20,430 at the American Airlines Center . However , the game 's overall top scorer was Dwyane Wade with 32 points for the Heat , while Chris Bosh helped himself to 24 points . But LeBron James struggled to find his shooting form , finishing with just eight points in a disappointing display . Game five is in Dallas on Thursday before the series switches back to Miami for game six on Sunday . This year 's final is a rematch of the 2006 NBA championship series that Miami took in six games for its first title in franchise history . Dallas has never won the NBA title in its 31-year history .
Dallas Mavericks defeat Miami Heat 86 - 83 to win Game 7 of the NBA Finals . The result means the teams are all - square at 2 - 2 in the best - of - seven series . The final is a rematch of the 1994 NBA championship series that Miami won in six .