MIAMI GARDENS, FLORIDA - MARCH 20: Janko Tipsarevic of Serbia returns a shot to Bradley Klahn during the Miami Open Presented by Itau at Hard Rock Stadium March 20, 2019 in Miami Gardens, Florida. (Photo by Matthew Stockman/Getty Images)
MIAMI GARDENS, FLORIDA - MARCH 20: Janko Tipsarevic of Serbia returns a shot to Bradley Klahn during the Miami Open Presented by Itau at Hard Rock Stadium March 20, 2019 in Miami Gardens, Florida. (Photo by Matthew Stockman/Getty Images)