April 1, 2018 - Miami, FL, United States - KEY BISCAYNE, FL - APRIL 1: John Isner (USA) in action defeats Alexander Zverev (GER) 67(4) 64 64 2018 Miami Open held at the Tennis Center at Crandon Park on April 1, 2018.   Credit: Andrew Patron/Zuma Wire (Credit Image: © Andrew Patron via ZUMA Wire)