The swimmer, Mohammad Alirezaei, did not compete in the men's 100-meter breaststroke heat Saturday because of illness and not for any other reason, a spokesman for the Iranian Embassy in Beijing told CNN.

CNN: Iranian swimmer quits Olympic race against Israeli

Mr. Siegel got his first high-profile test during the U.S. track and field trials in late June when Jeneba Tarmoh finished third in the 100-meter sprint but was later declared in a dead heat with Allyson Felix.

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