BEIJING—Clear some more space in that pile of pretty Olympic medal boxes. Shawn Johnson and Nastia Liukin are bringing home more loot, including a gorgeous gold of Johnson’s very own.

Johnson beat her friend and teammate on the balance beam, the last women’s gymnastics event at the Beijing Games

“I finished off the Olympic Games with, to me, the most perfect ending ever,” Johnson said, beaming as she tugged at the ribbon around her neck. “To finally get the gold medal ... on my very last routine meant the world to me.”

And it means the Americans will be stru...

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