Kei Nishikori has attained his goal of reaching the Top 10, becoming the first Japanese male to crack the Top 10 in the ATP rankings.
"It was a big goal for me to get into the top 10, but it is only for one week for now so I have to keep playing better tennis," the 24-year-old Nishikori said.
Nishikori, who hired Michael Chang this season to help him get into the Top 10, secured his spot when he got to the Madrid semifinals, then converted his 10th match point to defeat David Ferrer and reach his first Masters final.
"We have been working really hard as a team. I was very proud of Peng reaching No.1 earlier this year and now I am happy we can share the No.1," said Hsieh.
In February, Peng partnered Hsieh to capture the Doha title, their 10th title together, and achieve a milestone. She became doubles world No. 1 and China's first World No.1, male or female, in singles or doubles.
Li Na is the first player from China to be No. 2 in women's singles.