MIAMI (Reuters) - LeBron James added to his former team's misery by helping the Miami Heat to a 117-90 blowout win over Cleveland on Monday, handing the reeling Cavaliers a franchise single-season record 21st straight loss.

James, who angered Cleveland fans when he announced his decision to sign with the Heat on a nationally televised show last July, had 24 points and eight assists while Dwyane Wade had a game-high 34 points in a rout of the NBA's worst team.

Antawn Jamison led Cleveland with 21 points and 10 rebounds but the Cavaliers (8-40) could not halt their skid and are now two losses shy of tying the single-season NBA losing streak record shared by the Vancouver Grizzlies (1995-96) and Denver Nuggets (1997-98).

James, the two-times reigning NBA Most Valuable Player, has earned victories in each of the Heat's (34-14) three games against his former team this season.

The two teams will have their final meeting of the regular season on March 29 when Miami travels to Cleveland.

(Writing by Jahmal Corner in Los Angeles; Editing by Frank Pingue)