/https%3A%2F%2Fsportsmole-media-prod.s3.gra.io.cloud.ovh.net%2F13%2F41%2Fkei-nishikori.jpg "Chang joins Nishikori coaching team")
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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