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INDIAN WELLS, CALIFORNIA - MARCH 10: Kei Nishikori of Japan signs autographs after his three set victory against Adrian Mannarino of France during their men's singles second round match on day seven of the BNP Paribas Open at the Indian Wells Tennis Garden on March 10, 2019 in Indian Wells, California. (Photo by Clive Brunskill/Getty Images)

INDIAN WELLS, CALIFORNIA - MARCH 10: Kei Nishikori of Japan signs autographs after his three set victory against Adrian Mannarino of France during their men's singles second round match on day seven of the BNP Paribas Open at the Indian Wells Tennis Garden   on March 10, 2019 in Indian Wells, California. (Photo by Clive Brunskill/Getty Images)