Zheng Jie to work on her serve with new coach

Chinese tennis ace Zheng Jie says she is keen to improve her serve, the weakest link of her game, ahead of the new season with the help of an American coach.

"The coach will be here next month," Zheng said on the sidelines of her tennis clinic for primary and high school students in Beijing at the weekend. However, she refused to name her new mentor.

"I am expecting positive results," she said.