Serena Williams kept the No. 1, and added No. 50.

Williams beat Maria Sharapova 6-1, 6-4 in the final of the Madrid Open Sunday to retain her No. 1 ranking and collect her 50th career title, while Rafael Nadal eased by Stanislas Wawrinka 6-2, 6-4 for his fifth title since returning from a knee injury.