ATLANTA — The Seattle Storm completed their undefeated march through the postseason, beating the Atlanta Dream 87-84 on Thursday night for a three-game sweep in the WNBA finals.

Swin Cash led a balanced Seattle offense with 18 points as the Storm overcame 35 points by Atlanta's Angel McCoughtry.

Seattle won each of its seven postseason games for its second WNBA title. The Storm also won the 2004 championship.

McCoughtry, who set a WNBA playoff record with 42 points in the Dream's Eastern Conference finals clinching win over the New York Liberty, tried to rally Atlanta with nine points in the final 2:30. But McCoughtry and Coco Miller missed 3-pointers in the final 6 seconds, setting off a celebration by Seattle's players.