Zheng Jie beats Pennetta in Auckland final

Zheng Jie rounded off a stunning week in Auckland with victory over the number 4 seed, Flavia Pennetta in the final.  Unfortunately, Pennetta had to retire at the start of the third set because of a back injury trailing at 2-6 6-3 2-0 down.  This was Zheng’s fourth title on the WTA tour, but her…