Sharapova suffers shock defeat

Flavia Pennetta caused the biggest upset of the US Open so far with a gutsy 6-3 3-6 6-4 victory over third seed Maria Sharapova on Arthur Ashe Stadium.

The 2006 champion, who had been the second favourite for the title, paid for 12 double faults and 60 unforced errors as Pennetta progressed to a fourth-round meeting with Peng Shuai.