Serena blitzes Li to reach U.S. Open final NEW YORK (Reuters) - Defending champion Serena Williams beat China's Li Na 6-0 6-3 on Friday to reach her second consecutive U.S. Open final. With the victory, the top-seeded Williams set up a rematch of last year's final against Belarussian second-seed Victoria Azarenka, who beat Flavia Pennetta in Friday's other semi-final. Williams, a 16-times grand slam winner seeking her fifth U.S. Open title, enters Sunday's final having not dropped a set at Flushing Meadows this year. Reporting by Will Swanton; Editing by Frank Pingue