INDIANAPOLIS – Michael Phelps called it quits because of a sore neck at the U.S. nationals, leaving the spotlight to rival Ryan Lochte, who qualified Friday for the world championships later this month.

Phelps withdrew from the 100-meter freestyle heats in the morning on the advice of a doctor after waking up a day earlier with a kink on the left side of his neck. He swam through the pain to set a world record in the 100 butterfly on Thursday, but said he felt worse Friday despite receiving numerous treatments.

“It wasn’t fun swimming the 100 fly with that,” he said. “I...

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