"Some days more than others," he said. "I never thought about it out there today. Haven't really thought about it much. Felt like another day out there to me. Nothing new."
Querrey won despite a lack of rest. He's staying near downtown Miami, site of a weekend electronic music festival.
"I'm not sleeping well because of this Ultra Festival going on," he said. "I could hear the bass, and strobe lights were shining in my hotel, so it's hard to sleep."
Isner said the festival hasn't bothered him.
"I can sleep through anything," he said. "I can sleep through a train wreck. Do not hear it, which is good."
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