Roberta Vinci beats No . 7 seed Samantha Stosur at Dubai Championships . Unseeded Italian will now play doubles partner and 'sister ' Sara Errani . Petra Kvitova knocks out No . 3 seed Agnieszka Radwanska . TL;DR Rafael Nadal wins the Qatar Open in Doha with a 6-3, 6-3 win over Roger Federer.
Roberta Vinci beats No . 7 seed Samantha Stosur at Dubai Championships . Unseeded Italian will now play doubles partner and 'sister ' Sara Errani . Petra Kvitova knocks out No . 3 seed Agnieszka Radwanska . Juan Martin Del Porto into quarterfinals at Open 13 in Marseille .