It's a pain in the neck for Michael Phelps

Michael Phelps had to pull out of the morning heats of the 100-metre freestyle at the US Nationals.

Phelps, who won eight gold medals in Beijing, had been suffering from a sore neck.

"I could hardly move my neck to breath," he said. "We decided it was better to take the precautionary route and scratch this morning's race."

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