Russian Maria Sharapova regained her best tennis to eliminate compatriot Nadia Petrova, head of series number 5, and thereby advance the quarterfinals of the tennis tournament at Stanford, USA
Sharapova, the former world number one, appalled at just over an hour of a match by Petrova 6-1 and 6-2, who can not confirm that since the Siberian has only won one of their eight clashes.