Caroline Wozniacki is officially No. 1. The tennis star from Denmark took over the top ranking from Serena Williams on Thursday with a 6-3, 6-2 victory over Petra Kvitova of the Czech Republic at the China Open in Beijing. The rise to No. 1 comes in a season when Wozniacki reached the quarterfinals at Roland Garros and the U.S. Open semifinals. Read more: http://sports.espn.go.com/sports/tennis/news/story?id=5657758
