Playing someone like Karlovic is a mental test of epic proportions. You must decide beforehand that you are going to accept every ace he hits and not get frustrated when he cracks three in a row on break points. When you are lucky enough to put one of his serves back in the court, you must stay relaxed and not think, “This is my only chance. I must win this point.” There’s no quicker way to lose a point than that.

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