World number 39th Peng Shuai beat compatriot Zheng Jie 6-3, 6-3 in the 2014 US Open first round match here on Monday.
It was the sixth meeting between the two on WTA tournaments, and Peng leveled the overall score to 3-3 after Monday's victory.
"You always feel nervous when you meet a person from the same country," said Peng after the match.
"We were teammates for so many years and we know each other very well."
The 31-year-old Zheng planned to represent China to take part in Incheon Asiad next month.
Peng would face the fourth seed Agnieszka Randwanska in the next round.
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