NEW YORK (Reuters) - Defending champion Serena Williams slugged her way to a U.S. Open title rematch against Victoria Azarenka as the top two seeds scored straight-sets knockouts in their semi-finals on Friday.
World number one Williams thrashed a rattled Li Na 6-0 6-3, overcoming some staunch resistance at the end, while Azarenka returned to the Flushing Meadows final with a 6-4 6-2 win over unseeded Italian Flavia Pennetta.
