Serena Williams has beaten Sharapova 18 times in a row

American tennis star and former world number one Serena Williams, who is playing her first Grand Slam after giving birth, has beaten her rival Maria Sharapova 18 times in a row. The two will go head-to-head for the 22nd time today at the French Open Round of 16, with the 36-year-old American holding a 19-2 advantage over the 31-year-old Russian.