Maria Sharapova has warned her Wimbledon title rivals she is peaking just in time to take advantage of Serena Williams' stunning exit. Sharapova, who has yet to drop a set after routing Alison Riske 6-3, 6-0 in the third round, heads into the second week as the newly-installed favourite following Alize Cornet's shock 1-6, 6-3, 6-4 victory over world number one Williams on Saturday. Serena's defeat is a huge boost for French Open champion Sharapova, who had been scheduled to meet the American...