INDIAN WELLS, CA - MARCH 12: Rafael Nadal of Spain serves against Guido Pella of Argentina in their second round match during day seven of the BNP Paribas Open at Indian Wells Tennis Garden on March 12, 2017 in Indian Wells, California. (Photo by Clive Brunskill/Getty Images)

INDIAN WELLS, CA - MARCH 12:  Rafael Nadal of Spain serves against Guido Pella of Argentina in their second round match during day seven of the BNP Paribas Open at Indian Wells Tennis Garden on March 12, 2017 in Indian Wells, California.  (Photo by Clive Brunskill/Getty Images)