REUTERS: Angelique Kerber, who will reclaim the world number one ranking on Monday, breezed to a 6-2 6-1 second-round victory over fellow German Andrea Petkovic at the BNP Paribas Open on Saturday.Second-seed Kerber broke Petkovic to open the match and needed only 58 minutes to claim the victory in glaring sunshine in the California desert.” It was not so easy ,” said Kerber after the match.