James also hauled down seven rebounds and distributed six assists for Miami, which shot a sizzling 58.2 percent from the field and connected on nine 3-pointers.
Chris Bosh provided a double-double of 14 points and 10 rebounds as the Heat logged their second straight win.
Atlanta, meanwhile, saw its three-game winning streak snapped despite 22 points from Josh Smith.
Al Horford supplied 20 and 11 boards in the Hawks' setback.
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