When Ivo Karlovic, always the tallest and now the oldest player left in the tournament, launches one of his service bombs from its maximum height on Centre Court at Wimbledon on Monday afternoon, with his feet off the ground and his strong right arm stretched to the skies, the ball will start its 135mph journey towards Andy Murray roughly at the eye level of the chair umpire.
So, how does the 6ft 3in Murray, who has survived the tennis equivalent of facing Joel Garner at the Waca five times and won every encounter, prepare for such an ordeal?