Roland-Garros in Paris (CNN) Kei Nishikori wasn't even born when his coach, Michael Chang produced one of the most remarkable tennis shots of all time.

Struggling against the top-ranked Ivan Lendl in the fourth round of the 1989 French Open, Chang used an underarm serve as he clinched one of the biggest upsets of all time. Just 17 years of age, Chang went on to defeat Sweden's Stefan Edberg in the final to become the youngest male grand slam winner in the Open era, a record he still holds.

"I have seen this moment many times," Nishikori told CNN Sport in an interview at Roland-Garros in Paris after beating France's Jo-Wilfried Tsonga to reach the second round.

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"The way he fights, it was amazing," said the 29-year-old Japanese player. "I know he was hurting and cramping, but he kept fighting every point. Also, he had to use his mental strength, too. He changed up something, with the underarm serve, and it worked."

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