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INDIAN WELLS, CALIFORNIA - MARCH 15: Bill Gaates and Melinda Gates watch Rafael Nadal of Spain play Karen Khachanov of Russia during the quarterfinals of the BNP Paribas Open at the Indian Wells Tennis Garden on March 15, 2019 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)

INDIAN WELLS, CALIFORNIA - MARCH 15: Bill Gaates and Melinda Gates watch Rafael Nadal of Spain play Karen Khachanov of Russia during the quarterfinals of the BNP Paribas Open at the Indian Wells Tennis Garden on March 15, 2019 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)