Michael Chang joins Kei Nishikori coaching team

Kei Nishikori of Japan celebrates his win against Grigor Dimitrov of Bulgaria during day two of the Shanghai Rolex Masters at the Qi Zhong Tennis Center on October 8, 2013
© Getty Images
Former French Open champion Michael Chang teams up with Kei Nishikori as a part-time coach.

Former French Open champion Michael Chang has been hired by Kei Nishikori as a part-time coach.

The 41-year-old American will spend around 20 weeks in an advisory role with the Japanese world number 17.

Meanwhile, Dante Bottini will remain as Nishikori's full-time coach.

Chang became the youngest male winner of a Grand Slam when he triumphed as a 17-year-old at Roland Garros in 1989.

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ATP RankingsPoints
1Spain Rafael Nadal7,645
2Scotland flag Andy Murray7,150
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,690
5Serbia Novak Djokovic5,325
6Alexander Zverev4,470
7Croatia Marin Cilic4,155
8Austria Dominic Thiem4,030
9Bulgaria Grigor Dimitrov3,710
10Japan Kei Nishikori3,195
11Canada Milos Raonic2,870
12France Jo-Wilfried Tsonga2,690
13Belgium David Goffin2,525
14United States John Isner2,425
15Spain Roberto Bautista Agut2,425
16Pablo Carreno Busta2,385
17United States Jack Sock2,345
18Australia Nick Kyrgios2,325
19Czech Republic Tomas Berdych2,310
20Lucas Pouille2,210
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