MIAMI GARDENS, FLORIDA - MARCH 24: A general view of Novak Djokovic of Serbia serving to Federico Delbonis of Argentina during day seven at the Miami Open Tennis on March 24, 2019 in Miami Gardens, Florida. (Photo by Julian Finney/Getty Images)
MIAMI GARDENS, FLORIDA - MARCH 24: A general view of Novak Djokovic of Serbia serving to Federico Delbonis of Argentina during day seven at the Miami Open Tennis on March 24, 2019 in Miami Gardens, Florida. (Photo by Julian Finney/Getty Images)