Serena Williams celebrates U.S. Open win

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The CBS News Roundup: Syria's President Bashar Assad told Charlie Rose the U.S. should "expect everything" in retaliation if it moves forward with a military strike; Diana Nyad plans to meet with skeptics who have raised questions about her record-breaking swim; Serena Williams is celebrating her 17th Grand Slam title -- all this and more. Alexander Trowbridge reports on the news you need to know.

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